Merge llvm-project main llvmorg-18-init-15692-g007ed0dccd6a
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15692-g007ed0dccd6a.
PR: 276104
MFC after: 1 month
(cherry picked from commit cb14a3fe5122c879eae1fb480ed7ce82a699ddb6)