all: merge dev.regabi to master when tree reopens

[jeremyfaller]

Development of the register ABI has continued while the 1.16 freeze has soaked. That work has wide-ranging effects on the compiler and runtime, and needs to be merged as soon as the tree reopens.

Register ABI tracking issue

Builder status

This is a tracking issue for merging the dev.regabi branch to master once 1.16 ships.

[dmitshur]

This issue is ready to proceed, see #44222 (comment). After this is done, please update that umbrella issue and let the next people in the list know. Thank you!

[gopherbot]

Change https://golang.org/cl/292709 mentions this issue: all: merge branch dev.regabi (d3cd4830ad) into master