Mike Ash 195e3807d1 [Runtime] Mark _swift_stdlib_operatingSystemVersion as __attribute__((const)). ...

This tells the compiler that repeated calls to this function will always generate the same result, which allows the optimizer to coalesce multiple calls, hoist calls out of loops, and other such nice things.

rdar://problem/20690429

2018-08-16 13:24:54 -04:00

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