««« CL 105140044 / c2832405e9b9
runtime: fix defer of nil func

Fixes #8047.

LGTM=r, iant
R=golang-codereviews, r, iant
CC=dvyukov, golang-codereviews, khr
https://golang.org/cl/105140044
»»»

LGTM=r
R=golang-codereviews, r
CC=adg, golang-codereviews, iant
https://golang.org/cl/103370044