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[ARM][AArch64] generate subtarget feature flags
Reland of D120906 after sanitizer failures. This patch aims to reduce a lot of the boilerplate around adding new subtarget features. From the SubtargetFeatures tablegen definitions, a series of calls to the macro GET_SUBTARGETINFO_MACRO are generated in ARM/AArch64GenSubtargetInfo.inc. ARMSubtarget/AArch64Subtarget can then use this macro to define bool members and the corresponding getter methods. Some naming inconsistencies have been fixed to allow this, and one unused member removed. This implementation only applies to boolean members; in future both BitVector and enum members could also be generated. Differential Revision: https://reviews.llvm.org/D120906
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