* rtlanal.c: (rtx_unstable_p): HARD_FRAME_POINTER_REGNUM is not
an unstable register.
(rtx_varies_p, case REG): hard_frame_pointer_rtx is invariant.
(rtx_addr_can_trap_p, case REG): hard_frame_pointer_rtx won't trap.

From-SVN: r5465