Revert "cmd/compile: fix mishandling of unsafe-uintptr arguments with call method in go/defer"

This reverts commit CL 294849.

Reason for revert: this doesn't actually fix the issue, as revealed
by the noopt builder's failures.

Change-Id: Ib4ea9ceb4d75e46b3b91ec348b365fd8c83316ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/296629


Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>