runtime: improve barrier implementation layering #21640
This is a migration of some discussion in CL 37628.
bulkBarrierPreWrite calls writebarrierptr_prewrite1 repeatedly. Every call to writebarrierptr_prewrite1 does some sanity checks and hops on and off the system stack. This seems silly.
There are several TODOs here:
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Now that the buffered write barrier is implemented for all architectures, we can remove the old eager write barrier implementation. This CL removes the implementation from the runtime, support in the compiler for calling it, and updates some compiler tests that relied on the old eager barrier support. It also makes sure that all of the useful comments from the old write barrier implementation still have a place to live. Fixes #22460. Updates #21640 since this fixes the layering concerns of the write barrier (but not the other things in that issue). Change-Id: I580f93c152e89607e0a72fe43370237ba97bae74 Reviewed-on: https://go-review.googlesource.com/92705 Run-TryBot: Austin Clements <firstname.lastname@example.org> Reviewed-by: Rick Hudson <email@example.com> TryBot-Result: Gobot Gobot <firstname.lastname@example.org>