LGTM

================
Comment at: lib/AST/Expr.cpp:2899-2900
@@ +2898,4 @@
+    void VisitExpr(const Expr *E) {
+      if (E->HasSideEffects(Context, IncludePossibleEffects))
+        HasSideEffects = true;
+    }
----------------
Maybe only call `E->HasSideEffect(...)` if `HasSideEffect` is `false`. There's 
no point doing more checking once we've already found a side-effect.

http://reviews.llvm.org/D10211

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