[PATCH] [x86] Make vector legalization of extloads work more like the "normal" vector operation legalization with support for custom target lowering and fallback to expand when it fails, and use this to implement sext and anyext load lowering for x86 in a...

[hfinkel at anl.gov]

I don't need to see a follow-up patch based on my comments, and I have no further comments at this time ;)

http://reviews.llvm.org/D4654