[llvm] [llvm] Use llvm::sort (NFC) (PR #96434)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> > @kazutakahirata Please can you take a look at the test failures on EXPENSIVE_CHECKS builds?
> > https://lab.llvm.org/buildbot/#/builders/16/builds/500
> 
> Will do.

I've reverted the whole thing as https://github.com/llvm/llvm-project/commit/fef144cebb378f550ef098d370316554d647f625 for simplicity even though the culprit is under those hunks under `llvm/lib/Target`.

https://github.com/llvm/llvm-project/pull/96434