* coffread.c (end_psymtab): Free named symtabs and psymtabs for

    * coffread.c (end_psymtab):  Free named symtabs and psymtabs for
        a file, once a new symtab has been read for it.
        * symtab.h (GLOBAL_BLOCK, STATIC_BLOCK, FIRST_LOCAL_BLOCK):  New
        defines for the blocks of a blockvector that contain global and
        file-static symbols and the first of the smaller scope contours.
        * symtab.c (lookup_symbol, find_pc_symtab, find_pc_line,
        decode_line_1, make_symbol_completion_list):  Use the above.
        * coffread.c (end_symtab, patch_opaque_types):  Ditto.