[ic] Extract load IC proto array handlers handling to a separate stub.

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 3100096a4393b695884eee6364ba155351ccb841..f1725c0212b45d175946e1ba420d422680bb9b29 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -997,6 +997,7 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
                                       ParameterMode mode, Label* bailout);
 
   void LoadIC(const LoadICParameters* p);
+  void LoadICProtoArray(const LoadICParameters* p, compiler::Node* handler);
   void LoadGlobalIC(const LoadICParameters* p);
   void KeyedLoadIC(const LoadICParameters* p);
   void KeyedLoadICGeneric(const LoadICParameters* p);