message: cmake: Split profile data output files
  CTest can run unittests in parallel in separate processes. This orders profile data to be dumped in separate files (%p is replaced with process id) so they are not overwritten.
diff: @@ -12,4 +12,8 @@ target_sources(
  leb128_test.cpp
  )
  -gtest_discover_tests(fizzy-unittests TEST_PREFIX ${PROJECT_NAME}/unittests/)
  +gtest_discover_tests(
  + fizzy-unittests
  + TEST_PREFIX ${PROJECT_NAME}/unittests/
  + PROPERTIES ENVIRONMENT LLVM_PROFILE_FILE=${CMAKE_BINARY_DIR}/unittests-%p.profraw
  +)
  