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cd297b5b93
Noticed while investigating PR40483, and fixes the basic test case from the bug - but not a more general case. We're pretty weak at dealing with ADD/SUB combines compared to the SimplifyAssociativeOrCommutative/SimplifyUsingDistributiveLaws abilities that InstCombine can manage. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353044 91177308-0d34-0410-b5e6-96231b3b80d8