Nadav Rotem 8282fc9e3b Fix pr11266.
On x86: (shl V, 1) -> add V,V

Hardware support for vector-shift is sparse and in many cases we scalarize the
result. Additionally, on sandybridge padd is faster than shl.

llvm-svn: 143311
2011-10-30 13:24:22 +00:00
..
2011-10-30 13:24:22 +00:00