[stubs] Port LoadFunctionPrototypeStub to CSA

src/s390/code-stubs-s390.cc

Index: src/s390/code-stubs-s390.cc
diff --git a/src/s390/code-stubs-s390.cc b/src/s390/code-stubs-s390.cc
index b0578740bfe2d819e29f44991817ee956c825f9d..928341da7928a7a1a8cc662d7a8c36ae20af93f8 100644
--- a/src/s390/code-stubs-s390.cc
+++ b/src/s390/code-stubs-s390.cc
@@ -1219,21 +1219,6 @@ void JSEntryStub::Generate(MacroAssembler* masm) {
   __ b(r14);
 }
 
-void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
-  Label miss;
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  // Ensure that the vector and slot registers won't be clobbered before
-  // calling the miss handler.
-  DCHECK(!AreAliased(r6, r7, LoadWithVectorDescriptor::VectorRegister(),
-                     LoadWithVectorDescriptor::SlotRegister()));
-
-  NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, r6,
-                                                          r7, &miss);
-  __ bind(&miss);
-  PropertyAccessCompiler::TailCallBuiltin(
-      masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
-}
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
 // Just jump directly to runtime if native RegExp is not selected at compile
 // time or if regexp entry in generated code is turned off runtime switch or