[clang] [clang-tools-extra] [compiler-rt] [lldb] [Clang] [Sema] Make `-Wincompatible-pointer-types` an error by default (PR #157364)

[via llvm-commits]

Sirraide wrote:

Looks like this is causing errors in llvm-testsuite, but I’m candidly not sure how this is usually handled:
https://lab.llvm.org/buildbot/#/builders/210/builds/2746

https://github.com/llvm/llvm-project/pull/157364