[llvm] [X86] Enable alias analysis (AA) during codegen (PR #123787)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

Rebased this on https://github.com/llvm/llvm-project/pull/123934 (which should reuse the AA query cache a little more, since it's reused across DAG combines now). It likely still costs a few % (based on the previous change https://llvm-compile-time-tracker.com/compare.php?from=2d317d903a6c469d4bf64298b21b6dac83f1fc8b&to=033a963fb3f69491c8ada5422593b93d0b87f438&stat=instructions%3Au). 

https://github.com/llvm/llvm-project/pull/123787