runtime: add missing write barriers in append's copy of slice data
Found with GODEBUG=wbshadow=1 mode. Eventually that will run automatically, but right now it still detects other missing write barriers. Change-Id: Ic8624401d7c8225a935f719f96f2675c6f5c0d7c Reviewed-on: https://go-review.googlesource.com/2064Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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