[strong] Refactor ObjectStrength into a replacement for strong boolean args

src/ic/ic.cc

Index: src/ic/ic.cc
diff --git a/src/ic/ic.cc b/src/ic/ic.cc
index a8323ffe5aa0f8087be9fbe6b81a8effef08532d..2bd2fd479d60481002768a732184c97ea0657215 100644
--- a/src/ic/ic.cc
+++ b/src/ic/ic.cc
@@ -567,7 +567,7 @@ void CompareIC::Clear(Isolate* isolate, Address address, Code* target,
   // Only clear CompareICs that can retain objects.
   if (stub.state() != CompareICState::KNOWN_OBJECT) return;
   SetTargetAtAddress(address,
-                     GetRawUninitialized(isolate, stub.op(), stub.strong()),
+                     GetRawUninitialized(isolate, stub.op(), stub.strength()),
                      constant_pool);
   PatchInlinedSmiCode(address, DISABLE_INLINED_SMI_CHECK);
 }
@@ -2434,7 +2434,7 @@ MaybeHandle<Object> BinaryOpIC::Transition(
 
   // Compute the actual result using the builtin for the binary operation.
   Object* builtin = isolate()->js_builtins_object()->javascript_builtin(
-      TokenToJSBuiltin(state.op(), state.language_mode()));
+      TokenToJSBuiltin(state.op(), state.strength()));
   Handle<JSFunction> function = handle(JSFunction::cast(builtin), isolate());
   Handle<Object> result;
   ASSIGN_RETURN_ON_EXCEPTION(
@@ -2535,8 +2535,8 @@ RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite) {
 
 
 Code* CompareIC::GetRawUninitialized(Isolate* isolate, Token::Value op,
-                                     bool strong) {
-  CompareICStub stub(isolate, op, strong, CompareICState::UNINITIALIZED,
+                                     Strength strength) {
+  CompareICStub stub(isolate, op, strength, CompareICState::UNINITIALIZED,
                      CompareICState::UNINITIALIZED,
                      CompareICState::UNINITIALIZED);
   Code* code = NULL;
@@ -2546,8 +2546,8 @@ Code* CompareIC::GetRawUninitialized(Isolate* isolate, Token::Value op,
 
 
 Handle<Code> CompareIC::GetUninitialized(Isolate* isolate, Token::Value op,
-                                         bool strong) {
-  CompareICStub stub(isolate, op, strong, CompareICState::UNINITIALIZED,
+                                         Strength strength) {
+  CompareICStub stub(isolate, op, strength, CompareICState::UNINITIALIZED,
                      CompareICState::UNINITIALIZED,
                      CompareICState::UNINITIALIZED);
   return stub.GetCode();
@@ -2564,7 +2564,7 @@ Code* CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
   CompareICState::State state = CompareICState::TargetState(
       old_stub.state(), old_stub.left(), old_stub.right(), op_,
       HasInlinedSmiCode(address()), x, y);
-  CompareICStub stub(isolate(), op_, old_stub.strong(), new_left, new_right,
+  CompareICStub stub(isolate(), op_, old_stub.strength(), new_left, new_right,
                      state);
   if (state == CompareICState::KNOWN_OBJECT) {
     stub.set_known_map(
@@ -2675,8 +2675,8 @@ RUNTIME_FUNCTION(Unreachable) {
 
 
 Builtins::JavaScript BinaryOpIC::TokenToJSBuiltin(Token::Value op,
-                                                  LanguageMode language_mode) {
-  if (is_strong(language_mode)) {
+                                                  Strength strength) {
+  if (is_strong(strength)) {
     switch (op) {
       default: UNREACHABLE();
       case Token::ADD: return Builtins::ADD_STRONG;