[PATCH] Make musttail more robust for vector types on x86

[David Majnemer]

LGTM


================
Comment at: lib/CodeGen/CallingConvLower.cpp:204
@@ +203,3 @@
+  }
+
+  // Copy all the registers from the value locations we added.
----------------
It sounds like we can have `assert(NumLocs != Locs.size());` here.

http://reviews.llvm.org/D6156

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