[llvm][dsymutil][test] Create dedicated AArch64 directory (#168895) Currently the tests for LLVM targets `AArch64` and `ARM` were in the same directory. But if you only configured LLVM for one target (e.g., just `AArch64`, which is how I ran into this), then all tests under the ARM directory are marked `UNSUPPORTED`. This patch moves all the tests that are capable of running on `AArch64`-only targets into a dedicated `AArch64` directory. The tests that expected a plain `ARM` target were kept in the `ARM` directory. Drive-by: * Rename the `dummy-debug-map-amr64.map` to `dummy-debug-map-arm64.map` (note the typo in `amr64`)
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