[PATCH] ARM FastISel fix sext/zext fold

[JF Bastien]

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
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