Add support of CreateScalarUnsafe() for arm64 intrinsic in JIT

[kunalspathak]

Add support for Vector64.CreateUnsafe() and Vector128.CreateUnsafe() inside JIT that maps to one of fmov, ins or movi/movni instruction.

1. For float/double, if operand is immediate and can be encoded in fmov, use it. Else, use fmov on register.
2. For byte/sbyte/short/ushort/int/uint/long/ulong, if operand is immediate and can be encoded in movi/movi, use it. Otherwise, load the value in register and use ins to save in 0th lane.

Thanks @echesakovMSFT for the suggestion in #34485 (comment)

static void Vector64Test(Single value1, Single value2)
{
	var data0 = Vector64.CreateScalarUnsafe((float)5.9f);
	Console.WriteLine(data0);
	var data1 = Vector64.CreateScalarUnsafe((float)2.0f);
	Console.WriteLine(data1);
	var data2 = Vector64.CreateScalarUnsafe(4353);
	Console.WriteLine(data2);	
	var data3 = Vector64.CreateScalarUnsafe(32);
	Console.WriteLine(data3);
}

Output:

<5.9, 0>
<2, 0>
<4353, 0>
<32, 32>
<1.0696732, 0>
<43, 0>

Assembly output

G_M707_IG02:
       D28AE400          movz    x0, #0x5720
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF15C2          bl      CORINFO_HELP_NEWSFAST
       1C0005B0          ldr     s16, [@RWD00]
       FD000410          str     d16, [x0,#8]
       97FFADE3          bl      System.Console:WriteLine(System.Object)
       D28AE400          movz    x0, #0x5720
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF15BB          bl      CORINFO_HELP_NEWSFAST
       1E201010          fmov    s16, #2.0000
       FD000410          str     d16, [x0,#8]
       97FFADDC          bl      System.Console:WriteLine(System.Object)
       D28BA800          movz    x0, #0x5d40
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF15B4          bl      CORINFO_HELP_NEWSFAST
       52822021          mov     w1, #0x1101
       4E041C30          ins     v16.s[0], w1
       FD000410          str     d16, [x0,#8]
       97FFADD4          bl      System.Console:WriteLine(System.Object)
       D28BA800          movz    x0, #0x5d40
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF15AC          bl      CORINFO_HELP_NEWSFAST
       0F010410          movi    v16.2s, #0x20
       FD000410          str     d16, [x0,#8]
       97FFADCD          bl      System.Console:WriteLine(System.Object)
       D28AE400          movz    x0, #0x5720
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF15A5          bl      CORINFO_HELP_NEWSFAST
       BD401FA0          ldr     s0, [fp,#28]  // [V00 arg0]
       BD401BA1          ldr     s1, [fp,#24]  // [V01 arg1]
       1E212810          fadd    s16, s0, s1
       FD000410          str     d16, [x0,#8]
       97FFADC4          bl      System.Console:WriteLine(System.Object)
       D28BA800          movz    x0, #0x5d40
       F2A70740          movk    x0, #0x383a LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF159C          bl      CORINFO_HELP_NEWSFAST
       0B140261          add     w1, w19, w20
       4E041C30          ins     v16.s[0], w1
       FD000410          str     d16, [x0,#8]
       97FFADBC          bl      System.Console:WriteLine(System.Object)

RWD00  dd       40BCCCCDh

static void Vector128Test(double value1, double value2, long value3, long value4)
{
	var data0 = Vector128.CreateScalarUnsafe((float)5.9f);
	Console.WriteLine(data0);
	var data1 = Vector128.CreateScalarUnsafe((float)2.0f);
	Console.WriteLine(data1);
	var data2 = Vector128.CreateScalarUnsafe((long)4353);
	Console.WriteLine(data2);	
	var data3 = Vector128.CreateScalarUnsafe(32);
	Console.WriteLine(data3);
	var data4 = Vector128.CreateScalarUnsafe(value1 + value2);
	Console.WriteLine(data4);
	var data5 = Vector128.CreateScalarUnsafe(value3 + value4);
	Console.WriteLine(data5);
}

Output:

<5.9, 0, 0, 0>
<2, 0, 0, 0>
<4353, 0>
<32, 32, 32, 32>
<0.30312630808659924, 0>
<12884901882, 0>

Assembly output

G_M3610_IG02:
       D28C2E00          movz    x0, #0x6170
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13D2          bl      CORINFO_HELP_NEWSFAST
       1C0005B0          ldr     s16, [@RWD00]
       3C808010          str     q16, [x0,#8]
       97FFAC09          bl      System.Console:WriteLine(System.Object)
       D28C2E00          movz    x0, #0x6170
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13CB          bl      CORINFO_HELP_NEWSFAST
       1E201010          fmov    s16, #2.0000
       3C808010          str     q16, [x0,#8]
       97FFAC02          bl      System.Console:WriteLine(System.Object)
       D28CFD00          movz    x0, #0x67e8
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13C4          bl      CORINFO_HELP_NEWSFAST
       D2822021          mov     x1, #0x1101
       4E081C30          ins     v16.d[0], x1
       3C808010          str     q16, [x0,#8]
       97FFABFA          bl      System.Console:WriteLine(System.Object)
       D28DCC00          movz    x0, #0x6e60
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13BC          bl      CORINFO_HELP_NEWSFAST
       4F010410          movi    v16.4s, #0x20
       3C808010          str     q16, [x0,#8]
       97FFABF3          bl      System.Console:WriteLine(System.Object)
       D28E9B00          movz    x0, #0x74d8
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13B5          bl      CORINFO_HELP_NEWSFAST
       FD400FA0          ldr     d0, [fp,#24]  // [V00 arg0]
       FD400BA1          ldr     d1, [fp,#16]  // [V01 arg1]
       1E612810          fadd    d16, d0, d1
       3C808010          str     q16, [x0,#8]
       97FFABEA          bl      System.Console:WriteLine(System.Object)
       D28CFD00          movz    x0, #0x67e8
       F2A70720          movk    x0, #0x3839 LSL #16
       F2CFFFA0          movk    x0, #0x7ffd LSL #32
       97FF13AC          bl      CORINFO_HELP_NEWSFAST
       8B140261          add     x1, x19, x20
       4E081C30          ins     v16.d[0], x1
       3C808010          str     q16, [x0,#8]
       97FFABE2          bl      System.Console:WriteLine(System.Object)

RWD00  dd       40BCCCCDh

Fixes: #34485
Contributes to #33308

[kunalspathak]

/cc: @dotnet/jit-contrib , @tannergooding , @TamarChristinaArm

[echesakov]

LGTM (minus nit)

[kunalspathak]

Failure related to #35502