Remove strong mode support from count operations.

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3562 matching lines @@
     if (expr->op() == Token::INC) {
       __ SmiAddConstant(rax, rax, Smi::FromInt(1), constraints, &done,
                         Label::kNear);
     } else {
       __ SmiSubConstant(rax, rax, Smi::FromInt(1), constraints, &done,
                         Label::kNear);
     }
     __ jmp(&stub_call, Label::kNear);
     __ bind(&slow);
   }
-  if (!is_strong(language_mode())) {
-    ToNumberStub convert_stub(isolate());
-    __ CallStub(&convert_stub);
-    PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
-  }
+
+  // Convert old value into a number.
+  ToNumberStub convert_stub(isolate());
+  __ CallStub(&convert_stub);
+  PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
 
   // Save result for postfix expressions.
   if (expr->is_postfix()) {
     if (!context()->IsEffect()) {
       // Save the result on the stack. If we have a named or keyed property
       // we store the result under the receiver that is currently on top
       // of the stack.
       switch (assign_type) {
         case VARIABLE:
           PushOperand(rax);
@@ skipping 19 matching lines @@
   // Call stub for +1/-1.
   __ bind(&stub_call);
   __ movp(rdx, rax);
   __ Move(rax, Smi::FromInt(1));
   Handle<Code> code =
       CodeFactory::BinaryOpIC(isolate(), expr->binary_op()).code();
   CallIC(code, expr->CountBinOpFeedbackId());
   patch_site.EmitPatchInfo();
   __ bind(&done);
 
-  if (is_strong(language_mode())) {
-    PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
-  }
   // Store the value returned in rax.
   switch (assign_type) {
     case VARIABLE:
       if (expr->is_postfix()) {
         // Perform the assignment as if via '='.
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN, expr->CountSlot());
           PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
           context.Plug(rax);
@@ skipping 442 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64