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Make fallback implementation of pg_memory_barrier() work in 9.2 and 9.3.

Back-patch 9.4-era commit44cd47c into 9.2 and 9.3. As withmy back-patches of yesterday, this was not seen as necessary at the timebecause we didn't expect barrier.h to need to work before 9.4, butcommit37de8de invalidated that theory.Per an attempt to run gaur and pademelon over old branches they'venot been run on since ~2013.

1 parent9b2dc08 commit992df96Copy full SHA for 992df96

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src/backend/main
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`‎src/backend/main/main.c`

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Original file line number	Diff line number	Diff line change
`@@ -42,6 +42,8 @@`
`42`	`42`
`43`	`43`	`#include"bootstrap/bootstrap.h"`
`44`	`44`	`#include"postmaster/postmaster.h"`
	`45`	`+#include"storage/barrier.h"`
	`46`	`+#include"storage/spin.h"`
`45`	`47`	`#include"tcop/tcopprot.h"`
`46`	`48`	`#include"utils/help_config.h"`
`47`	`49`	`#include"utils/memutils.h"`
`@@ -311,6 +313,12 @@ startup_hacks(const char *progname)`
`311`	`313`
`312`	`314`	`}`
`313`	`315`	`#endif/* WIN32 */`
	`316`	`+`
	`317`	`+/*`
	`318`	`+ * Initialize dummy_spinlock, in case we are on a platform where we have`
	`319`	`+ * to use the fallback implementation of pg_memory_barrier().`
	`320`	`+ */`
	`321`	`+SpinLockInit(&dummy_spinlock);`
`314`	`322`	`}`
`315`	`323`
`316`	`324`

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Commit992df96

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`‎src/backend/main/main.c`

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