The setting for garbagecollector was added 7 years ago in 9ac91e5172 for
"debugging gc". graph_builder was added 6 years in a98801c1 when restoring the
-vmodule parameter after some temporary removal, without an explanation.
It seems safe to assume that the garbage collector has been debugged
sufficiently...
These defaults cause performance overhead:
- Enabling -vmodule slows down all log calls because checking verbosity
cannot take a simpler fast path.
- The amount of log output is much higher for those files.
The amount of log data also caused test output to get truncated, removing the
actual test failure explanation.
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