[PATCH] CodeGenPrep: sink extends of illegal types into use block.

[Manuel Jacob]

Hi t.p.northover,

This helps the instruction selector to lower an i64 * i64 -> i128
multiplication into a single instruction on targets which support it.

This is an update of D2973 which was reverted because of a bug reported
as PR19084.

http://llvm-reviews.chandlerc.com/D3021

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/X86/README.txt
  test/CodeGen/X86/mul128_sext_loop.ll
  test/Transforms/CodeGenPrepare/X86/extend-sink-hoist.ll
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