[PATCH] D11289: [X86] Widen the 'AND' mask if doing so shrinks the encoding size

[David Majnemer]

majnemer updated this revision to Diff 30072.
majnemer added a comment.

- Small cleanup
- Address review comments


http://reviews.llvm.org/D11289

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/shift-pair.ll
  test/CodeGen/X86/win64_frame.ll
  test/CodeGen/X86/zext-fold.ll

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