[PATCH] Sink integer extend into user blocks if the target type is going to be expanded.

[Manuel Jacob]

    - Add missing checks for TLI.
    - Convert test to use FileCheck.
    - Add specific tests for codegenprepare.

Hi t.p.northover,

http://llvm-reviews.chandlerc.com/D2973

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2973?vs=7570&id=7609#toc

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