[stubs] Port LoadFunctionPrototypeStub to CSA

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

Index: src/ic/ppc/handler-compiler-ppc.cc
diff --git a/src/ic/ppc/handler-compiler-ppc.cc b/src/ic/ppc/handler-compiler-ppc.cc
index d366b264bb23e34dd49faffd65555d668b807bc8..3da558d10e6a57227493842534541601afa3850f 100644
--- a/src/ic/ppc/handler-compiler-ppc.cc
+++ b/src/ic/ppc/handler-compiler-ppc.cc
@@ -176,15 +176,6 @@ 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);
-  __ mr(r3, 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.