[llvm-mca][AArch64] Refactor Neoverse tests to split out common inputs (NFC) (#170324) For many of these tests the inputs are very similiar with slight divergences, ideally we'd have common sources where we can to avoid subtle differences. Changes: - For basic tests there's a relatively large diff between V1 and all other cores because of 24f0901 (#128892) which makes it more complete. I've been thru the entire diff and 99% of the time V1 makes more sense, except for a couple of small changes (might post a separate patch for). Therefore I decided it's best to take V1-basic-instructions.s as the common source. - Split out FEAT_RCPC_IMMO tests from basic since N1 doesnt have this feature. - Split out FEAT_MTE tests. V2/V3 also have this feature but were missing tests, so I've added them. - Take 16-bit load/store register offset from V2/V3 (better coverage). The NEON and SVE tests are also quite substantial and could be made common, but there's also subtle differences that take time to go thru.
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