Devin Coughlin 664e7cc00e [Availability] Make _stdlib_isOSVersionAtLeast() no longer inlinable ...

To make it possible to change the implementation of
_stdlib_isOSVersionAtLeast(), remove the @inlinable attribute from it.

Since it is currently inlinable and calls the helper function
_swift_stdlib_operatingSystemVersion(), we’ll have to keep the
helper around as ABI.

This change causes a minor pessimization where the LLVM optimizer can no
longer reason that, for example, a successful check for 10.12 availability
means that a later check for 10.11 will always succeed. I don't expect this
pessimization to be a problem, but if needed we could write a custom SIL
optimizer pass to claw back the performance.

<rdar://problem/59447474>

2020-02-13 20:08:48 -08:00

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