[runtime] Replace the EQUALS builtin with proper Object::Equals.

src/ia32/code-stubs-ia32.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_IA32
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1849 matching lines @@
     __ ret(0);  // rax, rdx were pushed
   }
   __ bind(&runtime_call);
 
   // Push arguments below the return address.
   __ pop(ecx);
   __ push(edx);
   __ push(eax);
 
   // Figure out which native to call and setup the arguments.
-  if (cc == equal && strict()) {
+  if (cc == equal) {
     __ push(ecx);
-    __ TailCallRuntime(Runtime::kStrictEquals, 2, 1);
+    __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals, 2,
+                       1);
   } else {
-    int native_context_index;
-    if (cc == equal) {
-      native_context_index = Context::EQUALS_BUILTIN_INDEX;
-    } else {
-      native_context_index = is_strong(strength())
-                                 ? Context::COMPARE_STRONG_BUILTIN_INDEX
-                                 : Context::COMPARE_BUILTIN_INDEX;
-      __ push(Immediate(Smi::FromInt(NegativeComparisonResult(cc))));
-    }
+    int native_context_index = is_strong(strength())
+                                   ? Context::COMPARE_STRONG_BUILTIN_INDEX
+                                   : Context::COMPARE_BUILTIN_INDEX;
+    __ push(Immediate(Smi::FromInt(NegativeComparisonResult(cc))));
 
     // Restore return address on the stack.
     __ push(ecx);
 
     // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
     // tagged as a small integer.
     __ InvokeBuiltin(native_context_index, JUMP_FUNCTION);
   }
 
   __ bind(&miss);
@@ skipping 3913 matching lines @@
                            Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32