[PATCH] TTI: Add getCallInstrCost.

[hfinkel at anl.gov]

================
Comment at: include/llvm/Analysis/TargetTransformInfo.h:454
@@ +453,3 @@
+  /// \returns The cost of Call instructions.
+  unsigned getCallInstrCost(Function *F, Type *RetTy, ArrayRef<Type *> Tys,
+                            const TargetLibraryInfo *TLI) const;
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Please specifically mention that F may by nullptr.

http://reviews.llvm.org/D8094

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