design/24543: clarify use of signal for stack/reg maps
design/24543: clarify use of signal for stack/reg maps

Change-Id: I0322e2bdcd5e12394e411e9ed8d127c4208c504f
Reviewed-on: https://go-review.googlesource.com/c/161537
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

golang/proposal,golang/proposal