arm.c (arm_set_return_address): Use MEM_VOLATILE_P on the target mem instead of RTX_F...

arm.c (arm_set_return_address): Use MEM_VOLATILE_P on the target mem instead of RTX_FRAME_RELATED_P on the insn...

2017-10-08  Olivier Hainque  <hainque@adacore.com>

        * config/arm/arm.c (arm_set_return_address): Use MEM_VOLATILE_P
        on the target mem instead of RTX_FRAME_RELATED_P on the insn to
        prevent DSE.
        (thumb_set_return_address): Likewise.

From-SVN: r253522