Fix some build warnings in Nacl-specific code

BUG=None
[email protected]

Review URL: https://codereview.chromium.org/14840018

Author: eliben

lib/Analysis/NaCl/PNaClABITypeChecker.cpp

@@ -24,7 +24,7 @@ bool PNaClABITypeChecker::isValidType(const Type *Ty) {
   if (VisitedTypes.count(Ty))
     return VisitedTypes[Ty];
 
-  unsigned Width;
+  // unsigned Width;
   bool Valid = false;
   switch (Ty->getTypeID()) {
     // Allowed primitive types

lib/Transforms/NaCl/PromoteIntegers.cpp

@@ -440,7 +440,7 @@ static void convertInstruction(Instruction *Inst, ConversionState &State) {
     if (shouldConvert(Store->getValueOperand())) {
       splitStore(Store, State);
     }
-  } else if (CallInst *Call = dyn_cast<CallInst>(Inst)) {
+  } else if (isa<CallInst>(Inst)) {
     report_fatal_error("can't convert calls with illegal types");
   } else if (BinaryOperator *Binop = dyn_cast<BinaryOperator>(Inst)) {
     Value *NewInst = NULL;