IRGen: Another fix for compiling under opaque pointers

Author: aschwaighofer

lib/IRGen/GenObjC.cpp

@@ -422,6 +422,18 @@ getProtocolRefsList(llvm::Constant *protocol) {
   if (objCProtocolList->isNullValue()) {
     return std::make_pair(0, nullptr);
   }
+
+  if (!protocol->getContext().supportsTypedPointers()) {
+    auto protocolRefsVar = cast<llvm::GlobalVariable>(objCProtocolList);
+    auto sizeListPair =
+        cast<llvm::ConstantStruct>(protocolRefsVar->getInitializer());
+    auto size =
+        cast<llvm::ConstantInt>(sizeListPair->getOperand(0))->getZExtValue();
+    auto protocolRefsList =
+        cast<llvm::ConstantArray>(sizeListPair->getOperand(1));
+    return std::make_pair(size, protocolRefsList);
+  }
+
   auto bitcast = cast<llvm::ConstantExpr>(objCProtocolList);
   assert(bitcast->getOpcode() == llvm::Instruction::BitCast);
   auto protocolRefsVar = cast<llvm::GlobalVariable>(bitcast->getOperand(0));