[AArch64][SVE] Add SubtargetFeature to disable lowering unpredicated loads/stores as LDR/STR (#170256) PR #127837 changed the lowering for unpredicated loads/stores to use LDR/STR instead of LD1/ST1. However, on some CPUs, such as A64FX, there is a performance difference between LD1/ST1 and LDR/STR. As a result, the lowering introduced in #127837 can cause a performance regression on these targets. This patch adds a SubtargetFeature `disable-unpredicated-ld-st-lower` to disable this lowering. It is enabled for the A64FX target.
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