Silence some -Wuninitialized false positives with gcc.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141701 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index cb60df1..329dc5a 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -2698,7 +2698,8 @@
   // Long case, when Order isn't obviously constant.
 
   // Create all the relevant BB's
-  llvm::BasicBlock *MonotonicBB, *AcquireBB, *ReleaseBB, *AcqRelBB, *SeqCstBB;
+  llvm::BasicBlock *MonotonicBB = 0, *AcquireBB = 0, *ReleaseBB = 0,
+                   *AcqRelBB = 0, *SeqCstBB = 0;
   MonotonicBB = createBasicBlock("monotonic", CurFn);
   if (E->getOp() != AtomicExpr::Store)
     AcquireBB = createBasicBlock("acquire", CurFn);