Fix a few old-GCC warnings. No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163309 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index cbc7352..dcaa9ba 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -2440,7 +2440,7 @@
   if (N0 == N1) {
     // The sext(setcc()) => setcc() optimization relies on the appropriate
     // constant being emitted.
-    uint64_t EqVal;
+    uint64_t EqVal = 0;
     switch (getBooleanContents(N0.getValueType().isVector())) {
     case UndefinedBooleanContent:
     case ZeroOrOneBooleanContent: