[PATCH] [AArch64]Merge Extend and Shift into a UBFX

[Xu Jiangwei]

Hi t.p.northover, Jiangning,

This patch generates unfx when extending and then shifting a variable. For example,
and	w8, w0, #0xf8
lsr	w0, w8, #3

>

ubfx	w0, w0, 3, 5

Please have a look.
David

http://reviews.llvm.org/D5144

Files:
  lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  test/CodeGen/AArch64/andandshift.ll
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