Collection of coverage takes too long

[operasfantom]

Steps to reproduce

1. Open and configure project coreutils
2. Choose target libcoreutils.a
3. Generate tests for file gl/lib/fadvise.c
4. Run any test
5. See time statistics in logs

2022-04-19 13:38:57.584 [utbot-ZZR7      ] TimeExecStatistics.cpp:117      1| Time execution statistic report:
 | __________________________________________________ | ____________ | _______________ | ____________ | 
 |                                           Function | % of overall | Total time (ms) | Times called | 
 | __________________________________________________ | ____________ | _______________ | ____________ | 
 | CoverageAndResultsGenerator.cpp:37        generate |       100.00 |           72334 |            1 | 
 | CoverageAndResultsGenerator.cpp:86 collectCoverage |        99.68 |           72104 |            1 | 
 | TestRunner.cpp:135                        runTests |         0.19 |             136 |            1 | 
 | TestRunner.cpp:159                            init |         0.10 |              75 |            1 | 
 | LlvmCoverageTool.cpp:54        getCoverageCommands |         0.05 |              35 |            1 | 
 | __________________________________________________ | ____________ | _______________ | ____________ |