Null initialize a few variables flagged by

clang's -Wuninitialized-experimental warning.
While these don't look like real bugs, clang's
-Wuninitialized-experimental analysis is stricter
than GCC's, and these fixes have the benefit
of being general nice cleanups.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124073 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/CellSPU/SPUISelDAGToDAG.cpp

@@ -612,7 +612,7 @@ SDNode *
 SPUDAGToDAGISel::Select(SDNode *N) {
   unsigned Opc = N->getOpcode();
   int n_ops = -1;
-  unsigned NewOpc;
+  unsigned NewOpc = 0;
   EVT OpVT = N->getValueType(0);
   SDValue Ops[8];
   DebugLoc dl = N->getDebugLoc();