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        EXTRA_CONSTRAINTS; use anything not matched by REG_CLASS_FROM_LETTER.
        * recog.c (asm_operand_ok): Likewise.
        (preprocess_constraints, constrain_operands): Likewise.
        * regclass.c (record_reg_classes): Likewise.
        * reload.c (find_reloads): Likewise.
        * reload1.c (maybe_fix_stack_asms): Likewise.
        (reload_cse_simplify_operands): Likewise.
        * stmt.c (expand_asm_operands): Likewise.

        * md.texi: Update constraints documentation.
        * tm.texi (EXTRA_CONSTRAINT): Update.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@36023 138bc75d-0d04-0410-961f-82ee72b054a4