[gnutls-devel] GnuTLS | UBSAN: Fail tests if UB detected (!1136)

[Development of GNU's TLS library]

Tim Rühsen created a merge request: https://gitlab.com/gnutls/gnutls/merge_requests/1136

Branches: tmp-check-fuzz to master
Author:    Tim Rühsen



This MR is for squeezing out the detected UB.

The UBSAN runner has been modified to run with clang 9 on Fedora 31 and also includes ASAN.

Detected UB is now printed with a symbolized stack trace, to allow review / tracking directly from the CI artifacts (*.log files).

(In the end) it fixes #878.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [x] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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