James Molloy ba8562af44 Improve codegen for BUILD_VECTORs on ARM.
If we have a BUILD_VECTOR that is mostly a constant splat, it is often better to splat that constant then insertelement the non-constant lanes instead of insertelementing every lane from an undef base.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163304 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-06 09:55:02 +00:00
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