Arnold Schwaighofer d5cbb0bd62 Runtime changes for the copy-on-write existential implementation ...

Adds the runtime implementation for copy-on-write existentials. This support is
enabled if SWIFT_RUNTIME_ENABLE_COW_EXISTENTIALS is defined. Focus is on
correctness -- not performance yet.

Don't use allocate/deallocate/projectBuffer witnesses for globals in cow
existential mode.

Use SWIFT_RUNTIME_ENABLE_COW_EXISTENTIALS configuration to set the default for
SILOptions.

This includes an IRGen fix to use the right projection in
emitMetatypeOfOpaqueExistential if SWIFT_RUNTIME_ENABLE_COW_EXISTENTIALS is set.

Use unknownRetain instead of native retain in dynamicCastToExistential.

2017-03-15 14:54:55 -07:00

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