runtime: add a comment about thread pointer alignment on darwin/arm64
Address a review comment in CL 266373. Change-Id: Ic21bd5c4f87fd0c7dc594155a10fe23602698187 Reviewed-on: https://go-review.googlesource.com/c/go/+/266777 Trust: Cherry Zhang <cherryyz@google.com> Reviewed-by:Austin Clements <austin@google.com>
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