re PR target/64851 ([SH] Add atomic not)

re PR target/64851 ([SH] Add atomic not)

gcc/
	PR target/64851
	* config/sh/sync.md (atomic_fetch_notsi_hard,
	atomic_fetch_not<mode>_hard, atomic_fetch_not<mode>_soft_gusa,
	atomic_fetch_not<mode>_soft_tcb, atomic_fetch_not<mode>_soft_imask,
	atomic_not_fetchsi_hard, atomic_not_fetch<mode>_hard,
	atomic_not_fetch<mode>_soft_gusa, atomic_not_fetch<mode>_soft_tcb,
	atomic_not_fetch<mode>_soft_imask): New insns.

gcc/testsuite/
	PR target/64851
	* gcc.target/sh/pr64851-0.h: New
	* gcc.target/sh/pr64851-1.c: New
	* gcc.target/sh/pr64851-2.c: New
	* gcc.target/sh/pr64851-3.c: New
	* gcc.target/sh/pr64851-4.c: New

From-SVN: r220317