Remove 'abi-breaking-checks' lit feature.

Its only two uses were removed in r311730.
Effectively reverts r304851 (but that code has removed around a bit since then).
https://reviews.llvm.org/D46619

clang side done in r331871.

llvm-svn: 331872

test/lit.site.cfg.py.in

@@ -24,7 +24,6 @@ config.include_go_tests = @LLVM_INCLUDE_GO_TESTS@
 config.go_executable = "@GO_EXECUTABLE@"
 config.enable_shared = @ENABLE_SHARED@
 config.enable_assertions = @ENABLE_ASSERTIONS@
-config.enable_abi_breaking_checks = "@LLVM_ENABLE_ABI_BREAKING_CHECKS@"
 config.targets_to_build = "@TARGETS_TO_BUILD@"
 config.native_target = "@LLVM_NATIVE_ARCH@"
 config.llvm_bindings = "@LLVM_BINDINGS@".split(' ')

utils/lit/lit/llvm/config.py

@@ -101,10 +101,6 @@ class LLVMConfig(object):
                 self.with_environment(
                     'DYLD_INSERT_LIBRARIES', gmalloc_path_str)
 
-        breaking_checks = getattr(config, 'enable_abi_breaking_checks', None)
-        if lit.util.pythonize_bool(breaking_checks):
-            features.add('abi-breaking-checks')
-
     def with_environment(self, variable, value, append_path=False):
         if append_path:
             # For paths, we should be able to take a list of them and process all