[libc++] Remove libc++ Debian builders

[ldionne]

Summary

In accordance with the announcement on libcxx-dev and llvm-dev [1],
we are removing the libc++ specific buildbots in favor of running
those configurations in the pre-commit CI on Buildkite. This commit
removes the Debian-based libc++ build bots.

[1]: http://lists.llvm.org/pipermail/libcxx-dev/2020-November/001040.html

[ldionne]

Note that this patch isn't ready to be merged yet, I'm just setting it up for once the Debian builders have been migrated to Buildkite.

[ldionne]

Ping. If there is no desire to add BuildKite jobs running on Debian, that is fine, but I'd like those build bots to go so we can have CI in a single location.

[ldionne]

Thanks, I'll commit this.

[ldionne]

Committed as c744ef8bd3629a023a3958525aaf41b0be906528. I'm not sure there's automation to close Phab reviews on this repository (since it didn't close automatically), so I'll close myself.

buildbot/osuosl/master/config/builders.py

# Sanitizer builders.
     'factory' : OpenMPBuilder.getOpenMPCMakeBuildFactory(
                     env={
                         'PATH':'/home/llvmbb/bin/clang-latest/bin:/home/llvmbb/bin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin',
                         'CC': 'ccache clang', 'CXX': 'ccache clang++', 'CCACHE_CPP2': 'yes',
                     })},
 
 # Libc++ builders.
 
-    {'name': 'libcxx-libcxxabi-x86_64-linux-debian',
-    'tags'  : ["libcxx"],
-    'workernames': ['gribozavr4'],
-    'builddir': 'libcxx-libcxxabi-x86_64-linux-debian',
-    'factory': LibcxxAndAbiBuilder.getLibcxxAndAbiBuilder(
-                    env={'CC': 'clang', 'CXX': 'clang++'},
-                    lit_extra_args=['--shuffle'],
-                    check_libcxx_abilist=True)},
-
-    {'name' : 'libcxx-libcxxabi-x86_64-linux-debian-noexceptions',
-    'tags'  : ["libcxx"],
-    'workernames' : ['gribozavr4'],
-    'builddir': 'libcxx-libcxxabi-x86_64-linux-debian-noexceptions',
-    'factory' : LibcxxAndAbiBuilder.getLibcxxAndAbiBuilder(
-                    env={'CC': 'clang', 'CXX': 'clang++'},
-                    use_cache='Generic-noexceptions.cmake',
-                    lit_extra_args=['--shuffle'])},
-
-    {'name' : 'libcxx-libcxxabi-libunwind-x86_64-linux-debian',
-    'tags'  : ["libcxx"],
-    'workernames' : ['gribozavr4'],
-    'builddir': 'libcxx-libcxxabi-libunwind-x86_64-linux-debian',
-    'factory' : LibcxxAndAbiBuilder.getLibcxxAndAbiBuilder(
-             env={'CC': 'clang', 'CXX': 'clang++'},
-             cmake_extra_opts={'LIBCXXABI_USE_LLVM_UNWINDER': 'ON'},
-             lit_extra_args=['--shuffle'])},
-
-    {'name' : 'libcxx-libcxxabi-singlethreaded-x86_64-linux-debian',
-    'tags'  : ["libcxx"],
-    'workernames' : ['gribozavr4'],
-    'builddir': 'libcxx-libcxxabi-singlethreaded-x86_64-linux-debian',
-    'factory' : LibcxxAndAbiBuilder.getLibcxxAndAbiBuilder(
-                    env={'CC': 'clang', 'CXX': 'clang++'},
-                    use_cache='Generic-singlethreaded.cmake')},
-
     # ARMv7 LibC++ and LibC++abi tests (require Clang+RT)
     {'name' : 'libcxx-libcxxabi-libunwind-armv7-linux',
     'tags'  : ["libcxx"],
     'workernames': ['linaro-tk1-02'],
     'builddir': 'libcxx-libcxxabi-libunwind-armv7-linux',
     'factory' : LibcxxAndAbiBuilder.getLibcxxAndAbiBuilder(
                     cmake_extra_opts={
                         'LIBCXXABI_USE_LLVM_UNWINDER': 'ON',