* write.c (symbol_table_frozen): New variable, to be set after bfd_set_symtab

* write.c (symbol_table_frozen): New variable, to be set after bfd_set_symtab
is called.
(dump_section_relocs): Note whether a symbol is a section symbol or not.
(adjust_reloc_syms): For now, always supply an absolute symbol for fixups
without symbols but not yet `done'.  Use section_symbol to get the symbol,
instead of going directly for abs_symbol.
(write_relocs) [DEBUG4]: Abort if any symbol referred to by a reloc is not a
section symbol and is not in the symbol table.
(set_symtab): New function, broken out from write_object_file.  Counts symbol
table instead of relying on an earlier count.
(write_object_file): Call set_symtab, but do it after potentially invoking the
*_frob_file macros.  Don't bother counting symbols.  Call symbol_remove,
instead of expanding it in place.  Moved the conditionalized `object_file_size'
declaration down to conditionalized block where it's used.  When using the
absolute symbol for a fixup without a symbol, set sy_used_in_reloc.
(write_object_file) [BFD_ASSEMBLER]: Call section_symbol to get the correct
symbol for the absolute section.