[Bug symtab/30520] Slow lookup_symbol_in_objfile

["dmitry.neverov at jetbrains dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30520

--- Comment #4 from Dmitry Neverov <dmitry.neverov at jetbrains dot com> ---
With 'set debug symtab-create 1' gdb produces ~450Mb of logs between these 2
entries:

2023-06-06 10:54:51,286 <&"    [symbol-lookup] lookup_symbol_in_objfile:
lookup_symbol_in_objfile (_pcbnew.kiface, GLOBAL_BLOCK, wxObjectDataPtr,
VAR_DOMAIN)\n"
2023-06-06 10:55:50,418 <&"    [symbol-lookup] lookup_symbol_in_objfile:
lookup_symbol_in_objfile (...) = NULL\n"

All log entries are of the form like these:

<&"    [symtab-create] start_subfile: name =
/usr/include/x86_64-linux-gnu/c++/12/bits/c++config.h, name_for_id =
/usr/include/x86_64-linux-gnu/c++/12/bits/c++config.h\n"
<&"    [symtab-create] start_subfile: found existing symtab with name_for_id
/usr/include/x86_64-linux-gnu/c++/12/bits/c++config.h\n"

There are 1134332 '[symtab-create] start_subfile: name = ...' entries total,
707543 of them result in 'found existing symtab', 426789 don't find an existing
symtab.

There are 3519 unique names for symtab-create.

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