Add configs for -Werror buildbots run by Google.

[dlj]

Summary

This adds builder and slave configurations for buildbots that will
build with -DLLVM_ENABLE_WERROR. Since the default is to run without
this and finish tests, it's common that warnings will not be seen in
the buildbots. This may lead to problems if commits add warnings.

buildbot/osuosl/master/config/builders.py

#                                                                             '--enable-targets=arm'])},
          'builddir':"perf-x86_64-penryn-O3",
          'factory': PollyBuilder.getPollyLNTFactory(triple="x86_64-pc-linux-gnu",
                                                     #nt_flags=['--multisample=10', '--rerun'],
                                                     nt_flags=['--multisample=10'],
                                                     reportBuildslave=False,
                                                     package_cache="http://parkas1.inria.fr/packages",
                                                     submitURL=['http://gcc12.fsffrance.org:8808/submitRun','http://llvm.org/perf/submitRun'],
                                                     testerName='x86_64-penryn-O3')},
+
         {'name' : "clang-x86_64-linux-selfhost-modules",
          'slavenames' : ["modules-slave-1"],
          'builddir' : "clang-x86_64-linux-selfhost-modules",
          'factory' : ClangBuilder.getClangBuildFactory(triple='x86_64-pc-linux-gnu',
                                                        useTwoStage=True,
                                                        modules=True,
                                                        clean=False,
                                                        stage1_config='Release',
                                                        stage2_config='Release',
                                                        extra_configure_args=['-DCMAKE_C_COMPILER=clang',
                                                                              '-DCMAKE_CXX_COMPILER=clang++',
                                                                              '-DCMAKE_CXX_FLAGS=-stdlib=libc++',
                                                                              '-DLLVM_ENABLE_ASSERTIONS=ON'],
                                                        cmake='cmake')},
 
+        {'name' : "clang-x86_64-linux-werror",
+         'slavenames' : ["clang-werror-buildbot1"],
+         'builddir' : "clang-x86_64-linux-werror",
+         'factory' : ClangBuilder.getClangCMakeBuildFactory(
+                         triple='x86_64-pc-linux-gnu',
+                         useTwoStage=True,
+                         clean=False,
+                         stage1_config='Release',
+                         stage2_config='Release',
+                         runTestSuite=False,
+                         extra_configure_args=['-DCMAKE_C_COMPILER=clang',
+                                               '-DCMAKE_CXX_COMPILER=clang++',
+                                               '-DCMAKE_CXX_FLAGS=-stdlib=libc++',
+                                               '-DLLVM_ENABLE_LIBCXX=ON',
+                                               '-DLLVM_ENABLE_WERROR=ON',
+                                               '-DLLVM_ENABLE_ASSERTIONS=ON'],
+                         cmake='cmake')},
+
         {'name' : "clang-x64-ninja-win7",
          'slavenames' : ["windows7-buildbot"],
          'builddir' : "clang-x64-ninja-win7",
          'factory' : ClangBuilder.getClangCMakeBuildFactory(
                         clean=False,
                         vs='%VS120COMNTOOLS%',
                         vs_target_arch='x64',
                         testStage1=True,

buildbot/osuosl/master/config/slaves.py

32},
         # Debian 7.7 x86_64 8-core GCE instance
         create_slave("sanitizer-buildbot4", properties={'jobs': 8}, max_builds=1),
         # Debian 7.7 x86_64 8-core GCE instance
         create_slave("sanitizer-buildbot5", properties={'jobs': 8}, max_builds=1),
 
         # Debian 7.7 x86_64 GCE instance
         create_slave("modules-slave-1", properties={'jobs': 16}, max_builds=1),
 
+        # Ubuntu 14.04 x86_64 16-core GCE instance
+        create_slave("clang-werror-buildbot1", properties={'jobs': 16}, max_builds=1),
+
         # zEnterprise 196 (s390x), SLES 12
         create_slave("systemz-1", properties={'jobs': 4}, max_builds=1),
 
         # Ubuntu 14.04 x86_64, Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz
         create_slave("ericwf-buildslave", properties={'jobs': 4}, max_builds=2),
         # Ubuntu 14.10 x86_64, Intel(R) Xeon(R) CPU E3-1245 V2 @ 3.40GHz
         create_slave('ericwf-buildslave2', properties={'jobs': 4}, max_builds=2),
         # OS X 10.10 x86_64, Intel Core 2 Duo @ 2.40GHz