[StrTable] Switch AArch64 and ARM to use directly TableGen-ed builtin tables This leverages the sharded structure of the builtins to make it easy to directly tablegen most of the AArch64 and ARM builtins while still using X-macros for a few edge cases. It also extracts common prefixes as part of that. This makes the string tables for these targets dramatically smaller. This is especially important as the SVE builtins represent (by far) the largest string table and largest builtin table across all the targets in Clang.
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