go/format: add simple benchmark framework and basic benchmark

For now, this CL adds as a first benchmark the formatting of
a 10,000 element array literal. It is easy to add additional
test cases as we see fit.

	name                   time/op
	Format/array1-10000-4    26.7ms ± 7%

	name                   speed
	Format/array1-10000-4  2.43MB/s ± 6%

	name                   alloc/op
	Format/array1-10000-4    5.52MB ± 0%

	name                   allocs/op
	Format/array1-10000-4      119k ± 0%

Updates #26528.

Change-Id: Ic8ec8f70160d122b877740412d4d4406f5f4b345
Reviewed-on: https://go-review.googlesource.com/c/153642
Reviewed-by: Ian Lance Taylor <iant@golang.org>
1 file changed
tree: b3ce4babd9461377ea8f798e18ac6c36b598b969
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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