Fix TLS offset lookup on macOS ARM64 #1317
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Currently, when running Mono on macOS ARM64, this message appears in the log:
Found new TLS offset at 224Turns out, Mono hardcodes a byte offset into internal pthread TLS data structure in order to be able to retrieve TLS values from within other threads. This change merely updates the hardcoded offset on macOS to match the reality. This change affects only macOS ARM64 builds.
This whole code has been removed from upstream, so when we merge, we don't need to reapply this change.