Arthur Eubanks 093b2640ea [SimplifyLibCalls] Return Value from optimizeSinCosPi when making change
Or else InstCombine can incorrectly report that no change has been made.

This optimization doesn't really fit into InstCombine since it optimizes multiple instructions at once; there's likely a more comprehensive fix.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D146064
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This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.