[RDA] isSafeToDefRegAt: Look at global uses
We weren't looking at global uses of a value, so we could happily overwrite the register incorrectly. Differential Revision: https://reviews.llvm.org/D88554
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We weren't looking at global uses of a value, so we could happily overwrite the register incorrectly. Differential Revision: https://reviews.llvm.org/D88554