John McCall 3b4e0d307e Intrinsic support for pinning. ...

Using the intrinsics is obnoxious because I needed them
to return Builtin.NativeObject?, but there's no reasonable
way to safely generate optional types from Builtins.cpp.
Ugh.

Dave and I also decided that there's no need for
swift_tryPin to allow a null object.

Swift SVN r23824

2014-12-10 00:52:48 +00:00

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