Merge llvm-project release/15.x llvmorg-15.0.6-0-g088f33605d8a
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15.0.6-0-g088f33605d8a.
PR: 265425
MFC after: 2 weeks
(cherry picked from commit f3fd488f1e19a3d09c4bdcece893901de4f49cdd)