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Add ARM64 (aarch64) support to s_lock.h.

Use the same gcc atomic functions as we do on newer ARM chips.(Basically this is a copy and paste of the __arm__ code block,but omitting the SWPB option since that definitely won't work.)Back-patch to 9.2. The patch would work further back, but we'd alsoneed to update config.guess/config.sub in older branches to make thembuild out-of-the-box, and there hasn't been demand for it.Mark Salter

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src/include/storage
- s_lock.h

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`‎src/include/storage/s_lock.h`

Lines changed: 23 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -335,6 +335,29 @@ tas(volatile slock_t *lock)`
`335`	`335`	`#endif/* __arm__ */`
`336`	`336`
`337`	`337`
	`338`	`+/*`
	`339`	`+ * On ARM64, we use __sync_lock_test_and_set(int *, int) if available.`
	`340`	`+ */`
	`341`	`+#if defined(__aarch64__)\|\| defined(__aarch64)`
	`342`	`+#ifdefHAVE_GCC_INT_ATOMICS`
	`343`	`+#defineHAS_TEST_AND_SET`
	`344`	`+`
	`345`	`+#defineTAS(lock) tas(lock)`
	`346`	`+`
	`347`	`+typedefintslock_t;`
	`348`	`+`
	`349`	`+static __inline__int`
	`350`	`+tas(volatileslock_t*lock)`
	`351`	`+{`
	`352`	`+return__sync_lock_test_and_set(lock,1);`
	`353`	`+}`
	`354`	`+`
	`355`	`+#defineS_UNLOCK(lock) __sync_lock_release(lock)`
	`356`	`+`
	`357`	`+#endif/* HAVE_GCC_INT_ATOMICS */`
	`358`	`+#endif/* __aarch64__ */`
	`359`	`+`
	`360`	`+`
`338`	`361`	`/* S/390 and S/390x Linux (32- and 64-bit zSeries) */`
`339`	`362`	`#if defined(__s390__)\|\| defined(__s390x__)`
`340`	`363`	`#defineHAS_TEST_AND_SET`

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Commit612ecf3

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`‎src/include/storage/s_lock.h`

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