* symtab.h (GLOBAL_BLOCK, STATIC_BLOCK, FIRST_LOCAL_BLOCK): New

    * 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.
	* mipsread.c:  Use them.

        * coffread.c (end_psymtab):  Free named symtabs and psymtabs for
        a file, once a new symtab has been read for it.
        * mipsread.c:  FIXME.  We need to do the same for MIPS, but it
        looks harder to determine the top-level block before it's been
        queued to the psymtab list.