[AArch64][NFC] Refactor the tail-folding option
This patch does simple refactoring of the tail-folding option in preparation for enabling tail-folding by default for neoverse-v1. It adds a default tail-folding option field to the AArch64Subtarget class that can be set on a per-CPU. Differential Revision: https://reviews.llvm.org/D149659
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