aarch64: use -mtls-size=12 for faster tls reads#22284
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henderkes wants to merge 1 commit into
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picked out from #22231
will help most with #22278
benchmarked on aarch64-linux-gnu oracle cloud:
Initially went with a compile check, but tried cross-compiling for aarch64 and while it passed the compiler flag, the linker failed with unknown relocation (550).