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DAG: Match truncated rotation (PR35487)

Authored by hansw on Dec 4 2017, 12:39 PM.

Description

DAG: Match truncated rotation (PR35487)

If the truncation has been pushed past the or-node, look through it and
truncate afterwards.

Differential revision: https://reviews.llvm.org/D40792

llvm-svn: 319692