runtime: memory corruption from stack-allocated defer on 32-bit [1.15 backport] #41797
Description
@aclements requested issue #41795 to be considered for backport to the next 1.15 minor release.
@gopherbot, please open backports to Go 1.15 and 1.14.
This can cause random memory corruption on 32-bit architectures. The circumstances for it happening are incredibly narrow, but the fix is also trivial.