Adjust LLVM_ENABLE_ABI_BREAKING_CHECKS depending on NDEBUG

When assertions are disabled, the upstream build system disables
LLVM_ENABLE_ABI_BREAKING_CHECKS by default. Though the upstream build
syst

Adjust LLVM_ENABLE_ABI_BREAKING_CHECKS depending on NDEBUG

When assertions are disabled, the upstream build system disables
LLVM_ENABLE_ABI_BREAKING_CHECKS by default. Though the upstream build
system allows it to be force-enabled, it looks like that is not a
well-tested build-time configuration.

Therefore, always disable LLVM_ENABLE_ABI_BREAKING_CHECKS when
assertions are disabled, which will also save some more runtime cost
when people use WITHOUT_LLVM_ASSERTIONS.

PR: 280562
MFC after: 1 month

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Merge llvm-project release/16.x llvmorg-16.0.6-0-g7cbf1a259152

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-16.0.6-0-g7cbf1a259152 (aka 16.0.6 release).

Merge llvm-project release/16.x llvmorg-16.0.6-0-g7cbf1a259152

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-16.0.6-0-g7cbf1a259152 (aka 16.0.6 release).

PR: 271047
MFC after: 1 month

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Merge llvm-project main llvmorg-12-init-17869-g8e464dd76bef

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12-init-17869-g8e464dd76bef, the last commit bef

Merge llvm-project main llvmorg-12-init-17869-g8e464dd76bef

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12-init-17869-g8e464dd76bef, the last commit before the
upstream release/12.x branch was created.

PR: 255570
MFC after: 6 weeks

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Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.or

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.org/9.0.0/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/clang/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/lld/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/projects/libcxx/docs/ReleaseNotes.html

PR: 240629
MFC after: 1 month

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Regenerate config and version headers.

MFhead@r320180

Merge ^/head r319973 through 321382.

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
5.0.0 (trunk r308421). Upstream has branched for the 5.0.0 release,
which should be in about a month. Please report bugs and

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
5.0.0 (trunk r308421). Upstream has branched for the 5.0.0 release,
which should be in about a month. Please report bugs and regressions,
so we can get them into the release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

MFC after: 2 months

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Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306325, and update
build glue.

Initial update of clang/llvm build glue, for building just a minimal
clang executable.

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509). The release will follow soon.

Please note that from 3.5.0 onwards, clang, llvm and lldb r

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509). The release will follow soon.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64. See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes: yes
Exp-run: antoine
PR: 215969, 216008
MFC after: 1 month

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Initial updates to llvm/clang build glue.