[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.

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