[Mono] Enable X86Base.Pause test #73318
Merged
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Fixes #61693
SIMD intrinsics support for X86Base.Pause for Mono was originally added by Tanner via #61707. But soon it was reverted by #62157, since it caused test failures on CI. The change Tanner made originally was a good change. I am adding it back in this PR and make sure to exclude the test properly for Mono CI lanes. The Pause test should only run on Mono when LLVM is enabled.