PR target/52503
	* config/sh/sh.opt (msoft-atomic): Use Var instead of Mask.
	* config/sh/linux.h (TARGET_DEFAULT): Remove MASK_SOFT_ATOMIC.
	(SUBTARGET_OVERRIDE_OPTIONS): Define.


Co-Authored-By: Kaz Kojima <kkojima@gcc.gnu.org>

From-SVN: r185081