[clang] [clang][x86][bytecode] Replace interp__builtin_parity/clrsb/bitreverse/ffs with static bool interp__builtin_elementwise_int_unaryop callback (PR #162346)

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donneypr wrote:

> `/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/lib/AST/ByteCode/InterpBuiltin.cpp:716:13: error: unused function 'interp__builtin_rotate' [-Werror,-Wunused-function]`
> 
> Looks like this function is not used thus the Linux Build and Test failing, please let me know if this is accurate.

Nevermind, I think that was accidentally added when I was merging. The callback for interp__builtin_rotate was replaced in #160289.

https://github.com/llvm/llvm-project/pull/162346