Fix some unused variable, control reaches end of non-void function,
and uninitialized use options.

llvm-svn: 62270
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index de6a14b..6d98952 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -1219,6 +1219,7 @@
 APSInt Expr::EvaluateAsInt(ASTContext &Ctx) const {
   EvalResult EvalResult;
   bool Result = Evaluate(EvalResult, Ctx);
+  Result = Result;
   assert(Result && "Could not evaluate expression");
   assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer");