cmd/cgo: jmethodID/jfieldID is not mapped to uintptr if building with the Android NDK [1.15 backport]

[gopherbot]

@randall77 requested issue #40954 to be considered for backport to the next 1.15 minor release.

@gopherbot please open a backport issue for 1.15.

[randall77]

This issue prevents Go programs from running correctly on Android 11 (random, but somewhat reliable crashing).

I'm proposing we just backport to 1.15. Although this is a problem in earlier releases as well, we can require 1.15 for Android 11 support, which was just released.

[gopherbot]

Change https://golang.org/cl/255318 mentions this issue: cmd/compile: make Haspointers a method instead of a function

[gopherbot]

Change https://golang.org/cl/255320 mentions this issue: cmd/compile: don't allow go:notinheap on the heap or stack

[gopherbot]

Change https://golang.org/cl/255337 mentions this issue: cmd/compile: allow aliases to go:notinheap types

[gopherbot]

Change https://golang.org/cl/255321 mentions this issue: cmd/cgo: use go:notinheap for anonymous structs

[gopherbot]

Change https://golang.org/cl/255338 mentions this issue: cmd/compile: make go:notinheap error message friendlier for cgo

[bcmills]

The stack for this issue broke the x/perf tests via github.com/mattn/go-sqlite3 (CC @mattn):
https://build.golang.org/log/b3355d5757dfbd59df196f50ba5039883d208d44

# github.com/mattn/go-sqlite3
../../../../pkg/mod/github.com/mattn/go-sqlite3@v0.0.0-20161215041557-2d44decb4941/callback.go:101:6: type callbackArgRaw must be go:notinheap
FAIL	golang.org/x/perf/storage/app [build failed]

[bcmills]

Hmm, but the failure is at head, and this issue is a 1.15 backport. I'll open a new issue.

[gopherbot]

Change https://golang.org/cl/255637 mentions this issue: cmd/compile: propagate go:notinheap implicitly