Fix asserts in Vector<>

[EgorBo]

Fixes #78717 (and unblocks jit-diff)

This fixes two asserts:

1. This used to assert while it is expected to early out in importer as an unsupported type.

Int128 Foo(Vector<Int128> v) => v[0];

2. Prejitting of

        [Intrinsic]
        [CLSCompliant(false)]
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Vector<T> Load<T>(T* source)
            where T : unmanaged => LoadUnsafe(ref *source);

Fails in that assert assert(genActualType(arg->gtType) == genActualType(argType));
My understanding it's completely fine that we pass ULONG (representing pointer) to BYREF

PTAL @tannergooding

[ghost]

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Issue Details

---

Fixes (and unblocks jit-diff)

This fixes two asserts:
1)

Int128 Foo(Vector<Int128> v) => v[0];

this used to assert while is expected to early out in importer as an unsupported type.

Prejitting of

        [Intrinsic]
        [CLSCompliant(false)]
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Vector<T> Load<T>(T* source)
            where T : unmanaged => LoadUnsafe(ref *source);

Fails in that assert assert(genActualType(arg->gtType) == genActualType(argType));
where argType is BYREF and arg is ULONG.

PTAL @tannergooding

Author:	EgorBo
Assignees:	EgorBo
Labels:	area-CodeGen-coreclr
Milestone:	-

[EgorBo]

@jakobbotsch does it look good otherwise?

[jakobbotsch]

Ideally we should have this check outside the else but let's not rerun CI for it