runtime: avoid reference to stale stack after GC shrinkstack
Dangling pointer error. Unlikely to trigger in practice, but still. Found by running GODEBUG=efence=1 GOGC=1 trace.test. Change-Id: Ice474dedcf62dd33ab77526287a023ba3b166db9 Reviewed-on: https://go-review.googlesource.com/12991Reviewed-by: Austin Clements <austin@google.com>
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