Zaara Syeda 935474fef5 [MachineLICM] Re-enable hoisting of constant stores
This patch fixes an issue exposed on the SystemZ build bots when committing
https://reviews.llvm.org/rL327856. The hoisting was temporarily disabled with
an option. This patch now re-enables hoisting and checks that we only hoist a
store instruction when all its operands are either constant caller preserved
registers or immediates.

Differential Revision: https://reviews.llvm.org/D45286

llvm-svn: 329577
2018-04-09 14:50:02 +00:00
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