[compiler] Remove the special case "prototype" load in class literals.

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index af7d00f58bda96828afbddfef382a73eec76f99f..486b00584c1c8ae3df291da83014ed8de813ac0a 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -1366,9 +1366,23 @@ void FullCodeGenerator::VisitClassLiteral(ClassLiteral* lit) {
 
     __ CallRuntime(Runtime::kDefineClass);
     PrepareForBailoutForId(lit->CreateLiteralId(), TOS_REG);
+    __ Push(result_register());
+
+    // Load the "prototype" from the constructor.
+    __ Move(LoadDescriptor::ReceiverRegister(), result_register());
+    __ LoadRoot(LoadDescriptor::NameRegister(),
+                Heap::kprototype_stringRootIndex);
+    __ Move(LoadDescriptor::SlotRegister(), SmiFromSlot(lit->PrototypeSlot()));
+    CallLoadIC(NOT_INSIDE_TYPEOF);
+    PrepareForBailoutForId(lit->PrototypeId(), TOS_REG);
+    __ Push(result_register());
 
     EmitClassDefineProperties(lit);
 
+    // Set both the prototype and constructor to have fast properties, and also
+    // freeze them in strong mode.
+    __ CallRuntime(Runtime::kFinalizeClassDefinition);
+
     if (lit->class_variable_proxy() != nullptr) {
       EmitVariableAssignment(lit->class_variable_proxy()->var(), Token::INIT,
                              lit->ProxySlot());