Testsuite: check actual_prof_file only when needed
Might be a little faster. Avoids testing for #6113 (.prof file not written when process is killed with any signal but SIGINT) for tests that don't have a .prof.sample file (which is almost all of them) when running the profiling ways. Tests that were failing because of #6113: T8089, overflow1, overflow2 and overflow3.
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