Improve profiling support for repository_ctx.execute

This change improves upon #11131.
 * The first eighty characters of the command line are included
   in the profile. This should make it easier to correlate execution
   times with repository_ctx.execute callsides.
 * The different phases of a remote execution request are highlighted
   in the profile just as they are for remote action execution. In
   particular this exposes information about cache hits and execution
   times.

Example Profile

![Screenshot from 2020-04-17 15-20-46](https://user-images.githubusercontent.com/1388179/79573506-0d643000-80bf-11ea-90aa-9cf22624048c.png)

Closes #11143.

PiperOrigin-RevId: 307395271
3 files changed
tree: 68dd268ad6eef466a43e5898ccfb6f9c22ef41ba
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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