runtime: make ncgocall a global counter

ncgocall was stored per M, runtime.NumCgoCall lost the counter when a M die.

Fixes #46789

Change-Id: I85831fbb2713f4c30d1800d07e1f47aa0031970e
GitHub-Last-Rev: cbc15fa870de776d3fbf3b62fc9a5e01792e6a26
GitHub-Pull-Request: golang/go#46842
Reviewed-on: https://go-review.googlesource.com/c/go/+/329729
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alexander Rakoczy <alex@golang.org>
3 files changed
tree: 2c8a7170ee2a2cab388b65f735ca9fa3df63cbfc
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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