Revert 68936, LLVM still isn't ready to handle debug info + optimization.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68972 91177308-0d34-0410-b5e6-96231b3b80d8

tools/clang-cc/Backend.cpp

@@ -425,6 +425,12 @@ ASTConsumer *clang::CreateBackendConsumer(BackendAction Action,
                                           const CompileOptions &CompileOpts,
                                           const std::string& InFile,
                                           const std::string& OutFile) {
+  // FIXME: If optimizing, disable all debug info generation.  The LLVM
+  // optimizer and backend is not ready to handle it when optimizations
+  // are enabled.
+  if (CompileOpts.OptimizationLevel > 0)
+    const_cast<CompileOptions&>(CompileOpts).DebugInfo = false;
+    
   return new BackendConsumer(Action, Diags, LangOpts, CompileOpts,
                              InFile, OutFile);  
 }