RFA: test macro expansion in presence of #line directives

[Jim Blandy]

I've committed this.

Jim Blandy <jimb@redhat.com> writes:

> Here's a revision of this test, which depends on the addition of the
> gdb_internal_error_resync function and its use in gdb_test, done in
> the previous patch.
> 
> gdb/testsuite/ChangeLog:
> 2002-11-01  Jim Blandy  <jimb@redhat.com>
> 
> 	* gdb.base/step-line.exp: Check that GDB can handle filenames that
> 	appear in the line number info, but not in the preprocessor macro
> 	info.