pa.h (FIXED_REGISTERS): %r2 is no longer fixed.

        * pa.h (FIXED_REGISTERS): %r2 is no longer fixed.
        (REG_ALLOC_ORDER): Treat %r2 as a caller-saved allocatable
        register.  %r30 is fixed and therefore a "special" register.
        %fr22-%fr31 are caller-saved, so allocate them before the
        callee-saved 1.1 fp registers.  Allocate fp registers before
        general registers.  Fix typo for register 79.

        * pa.h (FIRST_PSEUDO_REGISTER): Update to take into account
        registers which are no longer known to the compiler.
        (FIXED_REGISTERS): Likewise.
        (CALL_USED_REGISTERS): Likewise.
        (HARD_REGNO_NREGS): Likewise.
        (HARD_REGNO_MODE_OK): Likewise.
        (REGNO_REG_CLASS): Likewise.
        (FUNCTION_VALUE): Likewise.
        (LIBCALL_VALUE): Likewise.
        (FUNCTION_VALUE_REGNO_P): Likewise.
        (FUNCTION_ARG_REGNO_P): Likewise.
        (FUNCTION_ARG): Likewise.
        (REGNO_OK_FOR_FP_P): Likewise.
        (REGISTER_NAMES): Likewise.
        (REG_CLASS_CONTENTS): Likewise.  Add %r1 to GENERAL_OR_FP_REGS
        and GENERAL_OR_SNAKE_FP_REGS.
        (REG_ALLOC_ORDER): Likewise.  Document and make allocation order
        "regular" across 1.0 and 1.1 cpus.

From-SVN: r3659