Greg Parker e223f1fc9b [IRGen][runtime] Simplify runtime CCs and entry point ABIs (#14175) ...

* Remove RegisterPreservingCC. It was unused.
* Remove DefaultCC from the runtime. The distinction between C_CC and DefaultCC
  was unused and inconsistently applied. Separate C_CC and DefaultCC are
  still present in the compiler.
* Remove function pointer indirection from runtime functions except those
  that are used by Instruments. The remaining Instruments interface is
  expected to change later due to function pointer liability.
* Remove swift_rt_ wrappers. Function pointers are an ABI liability that we
  don't want, and there are better ways to get nonlazy binding if we need it.
  The fully custom wrappers were only needed for RegisterPreservingCC and
  for optimizing the Instruments function pointers.

2018-01-29 13:22:30 -08:00

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