Revert of Version 5.0.71.10 (cherry-pick)

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 1424 matching lines @@
 
     __ bind(&undetectable);
     __ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
               1 << Map::kIsUndetectable);
     __ j(zero, &return_unequal, Label::kNear);
     __ Move(eax, Immediate(EQUAL));
     __ ret(0);  // eax, edx 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) {
-    {
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ Push(edx);
-      __ Push(eax);
-      __ CallRuntime(strict() ? Runtime::kStrictEqual : Runtime::kEqual);
-    }
-    // Turn true into 0 and false into some non-zero value.
-    STATIC_ASSERT(EQUAL == 0);
-    __ sub(eax, Immediate(isolate()->factory()->true_value()));
-    __ Ret();
+    __ push(ecx);
+    __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals);
   } else {
-    // Push arguments below the return address.
-    __ pop(ecx);
-    __ push(edx);
-    __ push(eax);
     __ 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.
     __ TailCallRuntime(Runtime::kCompare);
   }
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
@@ skipping 4449 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32