[llvm] Simple check to ignore Inline asm fwait insertion (PR #101686)

[via llvm-commits]

Temperature-block wrote:

@phoebewang  
updated with test-case change, wait needs to be inserted before final instruction in series of X87 instructions or when next instruction is a Nonwaitcontrol instruction which may reset the status registers
Please do let me know if something is amiss from my side,
Thank you

https://github.com/llvm/llvm-project/pull/101686