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Use "mb" not the nonexistent "rmb" for pg_read_barrier() on Alpha.
It's only necessary to fix this in 9.4; later versions don't have this code (because we ripped out Alpha support entirely), while earlier ones aren't actually using pg_read_barrier() anywhere. Per rather belated report from Christoph Berg.
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‎src/include/storage/barrier.h

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@@ -117,7 +117,7 @@ extern slock_t dummy_spinlock;
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* read barrier to cover that case. We might need to add that later.
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*/
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#define pg_memory_barrier() __asm__ __volatile__ ("mb" : : : "memory")
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#define pg_read_barrier() __asm__ __volatile__ ("rmb" : : : "memory")
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#define pg_read_barrier() __asm__ __volatile__ ("mb" : : : "memory")
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#define pg_write_barrier() __asm__ __volatile__ ("wmb" : : : "memory")
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#elif defined(__hppa) || defined(__hppa__) /* HP PA-RISC */
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