[clang] [X86] Emit Warnings for frontend options to enable knl/knm. (PR #75580)

[Freddy Ye via cfe-commits]

FreddyLeaf wrote:

ping for review
@RKSimon are we aligned on the direction to removing knl/knm supports in the 
end?

https://github.com/llvm/llvm-project/pull/75580
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