message: [SwiftASTContext] Remove abort and add FIXME
  There was an abort() in CanPassInRegisters to figure out which tests
  where hitting this code. At least TestSwiftReturns and TestSwiftStepping
  were failing because of this Darwin. I've removed the abort and replaced
  it with a FIXME.
diff: @@ -5222,7 +5222,9 @@ bool SwiftASTContext::IsVoidType(void *type) {
  }
  bool SwiftASTContext::CanPassInRegisters(const CompilerType &type) {
  - abort();
  + // FIXME: Implement this. There was an abort() here to figure out which tests
  + // where hitting this code. At least TestSwiftReturns and TestSwiftStepping
  + // were failing because of this Darwin.
  return false;
  }
  