r223814 - Fix a GCC error from r223803

[Duncan P. N. Exon Smith]

Author: dexonsmith
Date: Tue Dec  9 13:22:40 2014
New Revision: 223814

URL: http://llvm.org/viewvc/llvm-project?rev=223814&view=rev
Log:
Fix a GCC error from r223803

Modified:
    cfe/trunk/lib/CodeGen/CGDebugInfo.cpp

Modified: cfe/trunk/lib/CodeGen/CGDebugInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGDebugInfo.cpp?rev=223814&r1=223813&r2=223814&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGDebugInfo.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGDebugInfo.cpp Tue Dec  9 13:22:40 2014
@@ -2663,10 +2663,12 @@ void CGDebugInfo::EmitLocation(CGBuilder
 /// CreateLexicalBlock - Creates a new lexical block node and pushes it on
 /// the stack.
 void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
+  llvm::MDNode *Back = nullptr;
+  if (!LexicalBlockStack.empty())
+    Back = LexicalBlockStack.back().get();
   llvm::DIDescriptor D = DBuilder.createLexicalBlock(
-      llvm::DIDescriptor(LexicalBlockStack.empty() ? nullptr
-                                                   : LexicalBlockStack.back()),
-      getOrCreateFile(CurLoc), getLineNumber(CurLoc), getColumnNumber(CurLoc));
+      llvm::DIDescriptor(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
+      getColumnNumber(CurLoc));
   llvm::MDNode *DN = D;
   LexicalBlockStack.emplace_back(DN);
 }