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

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f110f21f451638e6f11d08d1fb792eaea8f5a1ae..450d0c12c29215c3b1af2c8f29037547a063e23c 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -121,6 +121,7 @@ class ObjectLiteral;
   V(StringAdd)                                \
   V(GetProperty)                              \
   V(LoadIC)                                   \
+  V(LoadICProtoArray)                         \
   V(KeyedLoadICTF)                            \
   V(StoreFastElement)                         \
   V(StoreField)                               \
@@ -2103,6 +2104,16 @@ class LoadICStub : public TurboFanCodeStub {
   DEFINE_CODE_STUB(LoadIC, TurboFanCodeStub);
 };
 
+class LoadICProtoArrayStub : public TurboFanCodeStub {
+ public:
+  explicit LoadICProtoArrayStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  void GenerateAssembly(CodeStubAssembler* assembler) const override;
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(LoadICProtoArray);
+  DEFINE_CODE_STUB(LoadICProtoArray, TurboFanCodeStub);
+};
+
 class LoadGlobalICStub : public TurboFanCodeStub {
  public:
   explicit LoadGlobalICStub(Isolate* isolate, const LoadGlobalICState& state)