[PATCH 2/4] gdb: use std::string in partial_symtab::partial_symtab / allocate_symtab

[Tom Tromey]

>>>>> "Simon" == Simon Marchi via Gdb-patches <gdb-patches@sourceware.org> writes:

Simon> From: Simon Marchi <simon.marchi@polymtl.ca>
Simon> This simplifies the code a bit.

Simon> gdb/ChangeLog:

Simon> 	* psymtab.c (partial_symtab::partial_symtab): Change
Simon> 	last_objfile_name to be an std::string.
Simon> 	* symfile.c (allocate_symtab): Likewise.

This looks good to me.

Tom