runtime: actually fix locking in BenchmarkMSpanCountAlloc

I just submitted CL 255297 which mostly fixed this problem, but totally
forgot to actually acquire/release the heap lock. Oops.

Updates #41391.

Change-Id: I45b42f20a9fc765c4de52476db3654d4bfe9feb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/255298
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
1 file changed
tree: 4807314ba1e6321c2e97574fb62e4a106c99fb75
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  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
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  18. test/
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