Merge llvm-project release/14.x llvmorg-14.0.0-rc1-74-g4dc3cb8e3255
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14.0.0-rc1-74-g4dc3cb8e3255.
PR: 261742
MFC after: 2 weeks
(cherry picked from commit d56accc7c3dcc897489b6a07834763a03b9f3d68)