ARM FastISel fix sext/zext fold
Sign- and zero-extension folding was slightly incorrect because it wasn't checking that the shift on extensions was zero. Further, I recently added AND rd, rn, #255 as a form of 8-bit zero extension, and failed to add the folding code for it. This patch fixes both issues. This patch fixes both, and the test should remain the same: test/CodeGen/ARM/fast-isel-fold.ll llvm-svn: 183794
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