Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

PR: 276104
MFC after: 1 month

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Merge ^/vendor/lvm-project/master up to its last change (upstream commit
e26a78e70), and resolve conflicts.

Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That i

Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

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Merge llvm trunk r366426, resolve conflicts, and update FREEBSD-Xlist.

Merge llvm trunk r351319, resolve conflicts, and update FREEBSD-Xlist.

Merge llvm trunk r321017 to contrib/llvm.

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306956, and update
build glue.

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305575, and update
build glue.

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305145, and update
build glue.

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304659, and update
build glue.

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304460, and update
build glue.