Merge llvm-project release/15.x llvmorg-15.0.7-0-g8dfdcc7b7bf6
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15.0.7-0-g8dfdcc7b7bf6.
PR: 265425
MFC after: 2 weeks
(cherry picked from commit 50d7464c3fe687c0a3d4dea6b96a5437779a3ef6)