Make Unsafe.AsRef inlineable

[jkotas]

The JIT inliner chokes on type mismatch on return. Make the method inlineable by round-tripping the value via local that avoids the type mismatch on return.

[jkotas]

@AndyAyersMS PTLA

[jkotas]

[MethodImpl(MethodImplOptions.NoInlining)]
static void Test(void * p)
{
    Unsafe.AsRef<int>(p) = 1;
}

Before:

push    ebp
mov     ebp,esp
call    dword ptr ds:[9754ECh] (System.Runtime.CompilerServices.Unsafe.AsRef[[System.Int32, mscorlib]](Void*), mdToken: 06000010)
mov     dword ptr [eax],1
pop     ebp
ret

After

push    ebp
mov     ebp,esp
mov     eax,ecx
mov     dword ptr [eax],1
pop     ebp
ret

[AndyAyersMS]

LGTM too, fwiw...