[Mono] Implement small types atomic intrinsics for CompareExchange and Exchange

[lambdageek]

Update After #99011 Mono now uses the slower managed fallback implementations of these methods from src/libraries/System.Private.CoreLib/src/System/Threading/Interlocked.cs:

    public static byte CompareExchange(ref byte location1, byte value, byte comparand);
    public static sbyte CompareExchange(ref sbyte location1, sbyte value, sbyte comparand);
    public static short CompareExchange(ref short location1, short value, short comparand);
    public static ushort CompareExchange(ref ushort location1, ushort value, ushort comparand);

and

    public static byte Exchange(ref byte location1, byte value);
    public static sbyte Exchange(ref sbyte location1, sbyte value);
    public static short Exchange(ref short location1, short value);
    public static ushort Exchange(ref ushort location1, ushort value);

We should implement intrinsics for them in the JIT and interpreter, instead.

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Original issue

After #92974 is merged, we will have icalls for CompareExchange and Exchange for byte, sbyte, shortandushort`

We should also implement these intrinsics directly in the JIT/AOT and interpreter

Part of #64658

[ghost]

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Issue Details

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After #92974 is merged, we will have icalls for

   public static byte CompareExchange(ref byte location1, byte value, byte comparand) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static sbyte CompareExchange(ref sbyte location1, sbyte value, sbyte comparand) { throw null; }
        public static short CompareExchange(ref short location1, short value, short comparand) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static ushort CompareExchange(ref ushort location1, ushort value, ushort comparand) { throw null; }

and

      public static byte Exchange(ref byte location1, byte value) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static sbyte Exchange(ref sbyte location1, sbyte value) { throw null; }
        public static short Exchange(ref short location1, short value) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static ushort Exchange(ref ushort location1, ushort value) { throw null; }

We should also implement these intrinsics directly in the JIT/AOT and interpreter

Part of #64658

Author:	lambdageek
Assignees:	-
Labels:	area-System.Threading
Milestone:	-

[ghost]

Tagging subscribers to this area: @SamMonoRT, @fanyang-mono
See info in area-owners.md if you want to be subscribed.

Issue Details

---

After #92974 is merged, we will have icalls for

   public static byte CompareExchange(ref byte location1, byte value, byte comparand) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static sbyte CompareExchange(ref sbyte location1, sbyte value, sbyte comparand) { throw null; }
        public static short CompareExchange(ref short location1, short value, short comparand) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static ushort CompareExchange(ref ushort location1, ushort value, ushort comparand) { throw null; }

and

      public static byte Exchange(ref byte location1, byte value) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static sbyte Exchange(ref sbyte location1, sbyte value) { throw null; }
        public static short Exchange(ref short location1, short value) { throw null; }
        [System.CLSCompliantAttribute(false)]
        public static ushort Exchange(ref ushort location1, ushort value) { throw null; }

We should also implement these intrinsics directly in the JIT/AOT and interpreter

Part of #64658

Author:	lambdageek
Assignees:	-
Labels:	area-System.Threading, untriaged, area-Codegen-Intrinsics-mono
Milestone:	-

[lambdageek]

/cc @SamMonoRT

[lambdageek]

/cc @steveisok

[lambdageek]

After #104558 this is now important (particular to intrinsify Interlocked.Exchange<bool> and enums) - see #105335

[lambdageek]

There's a detailed explanation of what happend in #104558 (comment)

[lambdageek]

fixed in .NET 10 by #106660, and for .NET 9 by #106897