[PATCH] Add 'musttail' marker to call instructions

[David Majnemer]

================
Comment at: include/llvm/IR/Instructions.h:1291
@@ -1281,1 +1290,3 @@
+  }
   void setTailCall(bool isTC = true) {
+    setInstructionSubclassData((getSubclassDataFromInstruction() & ~3) |
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Wouldn't it make more sense to have `setTailCall` take an `enum TailCallKind` instead of having both `setTailCall` and `setTailCallKind` ?


http://llvm-reviews.chandlerc.com/D3240