AST: Remove ProtocolDecl's overload of getDeclaredType()

Author: slavapestov

include/swift/AST/Decl.h

@@ -4310,11 +4310,6 @@ class ProtocolDecl final : public NominalTypeDecl {
   /// protocol.
   bool inheritsFrom(const ProtocolDecl *Super) const;
 
-  ProtocolType *getDeclaredType() const {
-    return reinterpret_cast<ProtocolType *>(
-      NominalTypeDecl::getDeclaredType().getPointer());
-  }
-  
   SourceLoc getStartLoc() const { return ProtocolLoc; }
   SourceRange getSourceRange() const {
     return SourceRange(ProtocolLoc, getBraces().End);

lib/AST/ASTPrinter.cpp

@@ -4102,7 +4102,8 @@ class TypePrinter : public TypeVisitor<TypePrinter> {
       case SILFunctionType::Representation::WitnessMethod:
         Printer << "witness_method: ";
         printTypeDeclName(
-            witnessMethodConformance.getRequirement()->getDeclaredType());
+            witnessMethodConformance.getRequirement()->getDeclaredType()
+                ->castTo<ProtocolType>());
         break;
       case SILFunctionType::Representation::Closure:
         Printer << "closure";