Merge llvm-project release/19.x llvmorg-19.1.4-0-gaadaa00de76e
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.4-0-gaadaa00de76e,
a.k.a. 19.1.4 release.
PR: 280562
MFC after: 1 month
(cherry picked from commit 415efcecd8b80f68e76376ef2b854cb6f5c84b5a)