Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
* elfread.c (elf_symfile_read): Protect dwarf2_initialize_objfile by
!objfile_has_partial_symbols. New comment.
* objfiles.c (objfile_has_partial_symbols): Call HAS_SYMBOLS if
SYM_READ_PSYMBOLS is not present. Extend the comment.
* symfile.h (struct sym_fns): Extend the sym_read_psymbols comment.
gdb/testsuite/
* gdb.base/gdbindex-stabs-dwarf.c: New file.
* gdb.base/gdbindex-stabs.c: New file.
* gdb.base/gdbindex-stabs.exp: New file.