Some tests fail with Code Coverage

[tzaeschke]

When building with:

cmake .. -DPHTREE_CODE_COVERAGE=ON -DCMAKE_BUILD_TYPE=Debug

Some test fail:

99% tests passed, 3 tests failed out of 382

Total Test time (real) =  31.55 sec

The following tests FAILED:
	352 - PhTreeBptPriorityQueueTest.SmokeTest (Failed)
	353 - PhTreeBptPriorityQueueTest.SmokeTestTop (Failed)
	360 - PhTreeBptFixedVectorTest.SmokeTest (SEGFAULT)
Errors while running CTest

The tests do not fail with:

• gcc/clang and bazel test ..., even when using asan, ubsan or valgrind-memcheck
• cmake .. -DPHTREE_CODE_COVERAGE=ON, i.e. without Debug mode
• cmake .. -DPHTREE_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE=Debug, i.e. without coverage mode

The test do fail with

• Desktop with: Ubuntu 22.04.1 / gcc 12.1.0
• GitHub Actions CI build with ubuntu-latest / GNU 11.3