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2454dd5d8b
This is a retry of r326502 with updates to the reassociate test file that I missed the first time. @test15_reassoc in the supposed -reassociate test file (except that it tests 2 other passes too...) shows that there's no clear responsiblity for reassociation transforms. Instcombine now gets that case, but only because the constant values are identical. Otherwise, it would still miss that pattern. Reassociate doesn't get that case because it hasn't been updated to use less than 'fast' FMF. llvm-svn: 326513