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Win32 symbolizer does not call SymCleanup()
absl/debugging/symbolize_win32.inc implements the symbolizer code for win32. However, while it calls SymInitialize() to init the symbolizer, it never calls SymCleanup() to tear it down correctly.
Per https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-symcleanup, "Failure to call this function causes memory and resource leaks in the calling application".
Probably the safest solution would be to replace InitializeSymbolizer() with e. g. a Symbolizer scoping object that could handle initialization and cleanup.
FYI, we're continuing to see test flakes in Chromium that may be caused by this issue: crbug.com/41496717.
@caraitto @pkasting I created #1871 for crbug.com/41496717. I don't think that not calling SymCleanup is the cause of the test flakiness we observe in Chromium. #1870 addresses the flakiness issue. I tested it locally on my devbox an couldn't observe any flakiness.
