ClangImporter: Stop calling getAllConformances() on protocols

Author: slavapestov

lib/ClangImporter/ImportDecl.cpp

@@ -6598,8 +6598,8 @@ void SwiftDeclConverter::importObjCProtocols(
     SmallVectorImpl<InheritedEntry> &inheritedTypes) {
   SmallVector<ProtocolDecl *, 4> protocols;
   llvm::SmallPtrSet<ProtocolDecl *, 4> knownProtocols;
-  if (auto nominal = dyn_cast<NominalTypeDecl>(decl)) {
-    nominal->getImplicitProtocols(protocols);
+  if (auto classDecl = dyn_cast<ClassDecl>(decl)) {
+    classDecl->getImplicitProtocols(protocols);
     knownProtocols.insert(protocols.begin(), protocols.end());
   }