Merge llvm-project release/16.x llvmorg-16.0.4-0-gae42196bc493

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-16.0.4-0-gae42196bc493 (aka 16.0.4 release).

PR: 271047
MFC after: 1 month

llvm-readobj: Attach to buildsystem

Also install it as readelf when MK_LLVM_BINUTILS is set.

Reviewed By: dim, arichardson
Differential Revision: https://reviews.freebsd.org/D32058

llvm-readobj: Attach to buildsystem

Also install it as readelf when MK_LLVM_BINUTILS is set.

Reviewed By: dim, arichardson
Differential Revision: https://reviews.freebsd.org/D32058