runtime: add support for range-over-func

Add runtime support for range over functions, specifically
for defer in the loop body. The defer is running in one
function but needs to append to the deferred function list
for a parent function. This CL implements the runtime
support for that, in the form of two new functions:
deferrangefunc, which obtains a token representing the
current frame, and deferprocat, which is like deferproc
but adds to the list for frame denoted by the token.

DO NOT REVIEW
This is part of a sequence of CLs demonstrating a proposal
to expand the applicability of range loops.

For proposal #61405.

Change-Id: I08adf359100856d21d7ff4b493afa229c9471e70
1 file changed
tree: 080d9f6b8452857fa0f0168e8336c1236bee7abe
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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