[patch] Fix a glitch in debugging 32-bit process with 64-bit GDB.

[Joel Brobecker]

> 2008-12-15  Paul Pluzhnikov  <ppluzhnikov@google.com>
> 
> 	* dbxread.c (read_ofile_symtab): Sign-extend 32-bit N_LSYM and
> 	N_PSYM STABS values for 64-bit GDB.

OK!

Thanks,
-- 
Joel