Merge branch 'reduce-instrumentation-overhead' into 'master'
Reduce instrumentation overhead ## What does this MR do? This MR reduces the overhead of instrumented methods. See the commit message of 905f8d76 for more information. ## Are there points in the code the reviewer needs to double check? Not that I can think of. ## Why was this MR needed? The overhead of method call instrumentation was too great. ## Does this MR meet the acceptance criteria? - [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added - [x] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~ - [x] ~~API support added~~ - Tests - [x] Added for this feature/bug - [ ] All builds are passing - [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides) - [x] Branch has no merge conflicts with `master` (if you do - rebase it please) - [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits) See merge request !5550
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