[PATCH] [x86] Do not convert to cmp32 for Atom arch.

[Jim Grosbach]

  Is it possible to reduce the testcase? There's a lot of things going on in there that aren't related to the check being done. The larger a testcase is, the more fragile it is when unrelated changes are made. The test should have just enough in it to trigger the code path we're interested in and no more.

http://llvm-reviews.chandlerc.com/D2824