Turn on the new constant expression evaluator; it isn't 
anywhere near complete, but I don't know of any issues, and it can 
handle enough to allow removing the I-C-E pointer cast hack.

llvm-svn: 54597
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index adc52e2..e516beb 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -21,7 +21,7 @@
 using namespace clang;
 using llvm::APSInt;
 
-#define USE_NEW_EVALUATOR 0
+#define USE_NEW_EVALUATOR 1
 
 static bool CalcFakeICEVal(const Expr *Expr,
                            llvm::APSInt &Result,