[PATCH] [TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is "free" for the target.

[hfinkel at anl.gov]

LGTM.


================
Comment at: include/llvm/Analysis/TargetTransformInfoImpl.h:424
@@ -423,2 +423,3 @@
 
     // Otherwise delegate to the fully generic implementations.
+    return static_cast<T *>(this)->getOperationCost(
----------------
Remove the comment; we're not delegating to the "fully generic" version any more.

http://reviews.llvm.org/D7585

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