Eli Friedman 23e60c7893 [AArch64] Add patterns for zext/sext of shift amount.
Not sure this is the best fix, but it saves an instruction for certain
constructs involving variable shifts.

Differential Revision: https://reviews.llvm.org/D55572

llvm-svn: 351768
2019-01-22 00:21:35 +00:00
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