swift234

Define functions using a new calling convention RuntimeCC1.

We annotate the most popular runtime functions in terms of how often they are invoked from Swift code:

- Many variants of retain/release functions are annotated to use the new calling convention.
  But those variants of retain/release functions that may result in calls of objc_retain or objc_release
  are not migrated to the new calling convention, because it results in significant performance degradations
  when objects of Obj-C derived classes are used.

- Some popular non-reference counting functions like swift_getGenericMetadata or swift_dynamicCast are annotated as well.