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Author SHA1 Message Date
Eli Friedman 733f4ed1bb [ARM] Prefer lsls+lsrs over lsls+ands or lsrs+ands in Thumb1. 
Saves materializing the immediate for the "ands".

Corresponding patterns exist for lsrs+lsls, but that seems less common
in practice.

Now implemented as a DAGCombine.

Differential Revision: https://reviews.llvm.org/D49585

llvm-svn: 337945
 2018-07-25 18:22:22 +00:00