Fix some use of uninit variables issues, reported by Anton.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42396 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/AST/CFG.cpp b/AST/CFG.cpp
index d91f9c3..e1c1a74 100644
--- a/AST/CFG.cpp
+++ b/AST/CFG.cpp
@@ -393,7 +393,7 @@
 CFGBlock* CFGBuilder::VisitCompoundStmt(CompoundStmt* C) {
   //   The value returned from this function is the last created CFGBlock
   //   that represents the "entry" point for the translated AST node.
-  CFGBlock* LastBlock;
+  CFGBlock* LastBlock = 0;
   
   for (CompoundStmt::reverse_body_iterator I = C->body_rbegin(),
        E = C->body_rend(); I != E; ++I )