[Bug symtab/29105] new DWARF reader still slow

["simon.marchi at polymtl dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29105

--- Comment #14 from Simon Marchi <simon.marchi at polymtl dot ca> ---
I was looking at another timeout failure that happens randomly on my system, it
points to this.  It's from test gdb.mi/mi-var-cmd.exp:

The test tries to create a varobj with expression "int".  It expects GDB to
error out with "Attempt to use a type name as an expression."
^error,msg="-var-create: unable to create variable object"

I can replicate this with:

$ ./gdb -nx -q --data-directory=data-directory
testsuite/outputs/gdb.mi/mi-var-cmd/mi-var-cmd -ex start
(gdb) set debug dwarf-read 1
(gdb) print int
...
[dwarf-read] process_queue: Expanding one or more symtabs of objfile
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug ...
[dwarf-read] process_queue: Expanding symtab of CU at offset 0x480bd4           
[dwarf-read] process_queue: Done expanding CU at offset 0x480bd4                
[dwarf-read] process_queue: Done expanding symtabs of
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug.       
[dwarf-read] process_queue: Expanding one or more symtabs of objfile
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug ...
[dwarf-read] process_queue: Expanding symtab of CU at offset 0x48cd5e           
[dwarf-read] process_queue: Done expanding CU at offset 0x48cd5e                
[dwarf-read] process_queue: Done expanding symtabs of
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug.   
[dwarf-read] process_queue: Expanding one or more symtabs of objfile
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug ...
[dwarf-read] process_queue: Expanding symtab of CU at offset 0x498c49           
[dwarf-read] process_queue: Done expanding CU at offset 0x498c49                
[dwarf-read] process_queue: Done expanding symtabs of
/usr/lib/debug/.build-id/69/389d485a9793dbe873f0ea2c93e02efaa9aa3d.debug.
...
Attempt to use a type name as an expression


The post-indexer-changes version takes a long time, expanding pretty much all
CUs, while the pre-indexer-changes version finishes almost instantly.

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