[AArch64] Avoid RegScavenger::forward in AArch64SpeculationHardening
RegScavenger::backward is preferred because it does not rely on accurate kill flags. Differential Revision: https://reviews.llvm.org/D150560
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RegScavenger::backward is preferred because it does not rely on accurate kill flags. Differential Revision: https://reviews.llvm.org/D150560