Cost Model: change the default cost of control flow instructions (br / ret / ...) to zero.

llvm-svn: 169423
diff --git a/llvm/lib/Target/TargetTransformImpl.cpp b/llvm/lib/Target/TargetTransformImpl.cpp
index b36e6f8..2df7263 100644
--- a/llvm/lib/Target/TargetTransformImpl.cpp
+++ b/llvm/lib/Target/TargetTransformImpl.cpp
@@ -283,7 +283,7 @@
  }
 
 unsigned VectorTargetTransformImpl::getCFInstrCost(unsigned Opcode) const {
-  return 1;
+  return 0;
 }
 
 unsigned VectorTargetTransformImpl::getCmpSelInstrCost(unsigned Opcode,