[PATCH] Catch more cases when diagnosing integer-constant-expression overflows.

[Richard Smith]

LGTM, thanks!


================
Comment at: lib/AST/ExprConstant.cpp:6851
@@ +6850,3 @@
+      LValue LV;
+      LHSOK = EvaluateLValue(E->getLHS(), LV, Info);
+      LHSOK = false;
----------------
Dead store; remove the `LHSOK = `.

http://reviews.llvm.org/D1238

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