Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
master 2e10b7a39b9, the last commit before the llvmorg-12-init tag, from
which release/11.x was branched.

Note that for now, I

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
master 2e10b7a39b9, the last commit before the llvmorg-12-init tag, from
which release/11.x was branched.

Note that for now, I rolled back all our local changes to make merging
easier, and I will reapply the still-relevant ones after updating to
11.0.0-rc1.

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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 lldb trunk r366426, resolve conflicts, and update FREEBSD-Xlist.

Update lldb to trunk r290819 and resolve conflicts.

Update lldb to release_39 branch r276489 and resolve immediate conflicts.

Update LLDB snapshot to upstream r201577

Highlights include:

- Improvements to the remote GDB protocol client
(r196610, r197579, r197857, r200072)

- Bug fixes for big-endian targets
(r196808)

Update LLDB snapshot to upstream r201577

Highlights include:

- Improvements to the remote GDB protocol client
(r196610, r197579, r197857, r200072)

- Bug fixes for big-endian targets
(r196808)

- Initial support for libdispatch (GCD) queues in the debuggee
(r197190)

- Add "step-avoid-libraries" setting
(r199943)

- IO subsystem improvements (including initial work on a curses gui)
(r200263)

- Various bug fixes for memory leaks, LLDB segfaults, the C++ demangler,
ELF core files, DWARF debug info, and others.

Sponsored by: DARPA, AFRL

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