[stubs] Port LoadFunctionPrototypeStub to CSA

src/ic/s390/handler-compiler-s390.cc

Index: src/ic/s390/handler-compiler-s390.cc
diff --git a/src/ic/s390/handler-compiler-s390.cc b/src/ic/s390/handler-compiler-s390.cc
index f958cc10fe3b3236007951ef4da437455d2e3d90..9f087977a1ec22facbfbcb4aed87d5123667de88 100644
--- a/src/ic/s390/handler-compiler-s390.cc
+++ b/src/ic/s390/handler-compiler-s390.cc
@@ -169,14 +169,6 @@ void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
   __ DecrementCounter(counters->negative_lookups_miss(), 1, scratch0, scratch1);
 }
 
-void NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(
-    MacroAssembler* masm, Register receiver, Register scratch1,
-    Register scratch2, Label* miss_label) {
-  __ TryGetFunctionPrototype(receiver, scratch1, scratch2, miss_label);
-  __ LoadRR(r2, scratch1);
-  __ Ret();
-}
-
 // Generate code to check that a global property cell is empty. Create
 // the property cell at compilation time if no cell exists for the
 // property.