> Be sure to mention how you tested a patch series.
>

This was tested on Fedora 13 GCC 4.4.4 by running the test suit. No 
regressions.

I also used "maint print statistics":

./gdb/gdb gdb/testsuite/gdb.cp/namespace -ex 'b main' -ex 'r' -ex 'maint 
print statistics'

no changes in bcach but a couple of objfiles got bigger probably because 
of the obstack allocations.

diff [...]/before after
[...]
<   Total memory used for objfile obstack: 47475
---
  >   Total memory used for objfile obstack: 51539
70c70
<   Total memory used for objfile obstack: 767363
---
  >   Total memory used for objfile obstack: 820195
[...]

The files were:
/usr/lib64/libstdc++.so.6 and
[...]/gdb/testsuite/gdb.cp/namespace

Updated patch attached.