Silence some -Wuninitialized false positives with gcc.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141701 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/StmtPrinter.cpp

@@ -1012,7 +1012,7 @@ void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
 }
 
 void StmtPrinter::VisitAtomicExpr(AtomicExpr *Node) {
-  const char *Name;
+  const char *Name = 0;
   switch (Node->getOp()) {
     case AtomicExpr::Load:
       Name = "__atomic_load(";

lib/CodeGen/CGExpr.cpp

@@ -2698,7 +2698,8 @@ RValue CodeGenFunction::EmitAtomicExpr(AtomicExpr *E, llvm::Value *Dest) {
   // 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);