Adding support for the X86Base.Pause intrinsic on Mono (dotnet#61707)

* Adding support for the X86Base.Pause intrinsic on Mono

* Re-enable the pause hwintrinsic test on Mono

Author: tannergooding

src/mono/mono/mini/simd-intrinsics.c

@@ -2310,6 +2310,7 @@ static SimdIntrinsic bmi2_methods [] = {
 static SimdIntrinsic x86base_methods [] = {
 	{SN_BitScanForward},
 	{SN_BitScanReverse},
+	{SN_Pause, OP_XOP, INTRINS_SSE_PAUSE},
 	{SN_get_IsSupported}
 };
 

src/mono/mono/mini/simd-methods.h

@@ -256,6 +256,7 @@ METHOD(ComputeCrc32C)
 // X86Base
 METHOD(BitScanForward)
 METHOD(BitScanReverse)
+METHOD(Pause)
 // Crypto
 METHOD(FixedRotate)
 METHOD(HashUpdateChoose)

src/tests/issues.targets

@@ -846,9 +846,6 @@
 
     <!-- Known failures for mono runtime on *all* architectures/operating systems in *all* runtime modes -->
     <ItemGroup Condition="'$(RuntimeFlavor)' == 'mono'" >
-        <ExcludeList Include = "$(XUnitTestBinBase)/JIT/HardwareIntrinsics/X86/X86Base/Pause*/**">
-            <Issue>https://github.com/dotnet/runtime/issues/61693</Issue>
-        </ExcludeList>
         <ExcludeList Include = "$(XunitTestBinBase)/reflection/GenericAttribute/**">
             <Issue>https://github.com/dotnet/runtime/issues/56887</Issue>
         </ExcludeList>