* config/arm/arm-protos.h (arm_gen_return_addr_mask): New
prototype.
* config/arm/arm.c (arm_gen_return_addr_mask): New function.
* config/arm/arm.h (MASK_RETURN_ADDR): Use arm_gen_return_addr_mask
if not APCS26 and not Thumb or ARMv4-or-higher. Use gen_int_mode
rather than GEN_INT.
* config/arm/arm.md (UNSPEC_CHECK_ARCH): Define.
(return_addr_mask, *check_arch2): New.
From-SVN: r56883
