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 r338150, and resolve conflicts.

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

Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304149, and update
build glue.

Update llvm to trunk r290819 and resolve conflicts.

Update llvm to release_39 branch r276489, and resolve conflicts.

Update llvm to trunk r256633.