Stephen Canon d2f695935f Add availability information to the new Math function protocols (#24187) ...

* Add availability information to the new Math function protocols

The protocols ElementaryFunctions, RealFunctions, and Real are new in Swift 5.1 and accordingly need to have availability attached to them for platforms that are ABI-stable. The actual implementation hooks (static functions) are unconditionally defined on scalar types and marked @_alwaysEmitIntoClient, so they are available even when targeting older library versions, but the protocols themselves, and anything defined in terms of them (the global functions and the SIMD extensions) is only available when targeting library versions that have the new protocols.

* Additionally provide concrete implementations of signGamma for each stdlib-builtin floating-point type.

* Remove Real[Functions] protocols pending re-review

Temporarily pull these back so we can make minor tweaks to the design and get a re-review on SE.

2019-04-29 17:39:33 -04:00

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