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

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 709 matching lines @@
     StringHelper::GenerateCompareFlatOneByteStrings(masm, lhs, rhs, a2, a3, t0,
                                                     t1);
   }
   // Never falls through to here.
 
   __ bind(&slow);
   // Prepare for call to builtin. Push object pointers, a0 (lhs) first,
   // a1 (rhs) second.
   __ Push(lhs, rhs);
   // Figure out which native to call and setup the arguments.
-  if (cc == eq && strict()) {
-    __ TailCallRuntime(Runtime::kStrictEquals, 2, 1);
+  if (cc == eq) {
+    __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals, 2,
+                       1);
   } else {
-    int context_index;
-    if (cc == eq) {
-      context_index = Context::EQUALS_BUILTIN_INDEX;
+    int context_index = is_strong(strength())
+                            ? Context::COMPARE_STRONG_BUILTIN_INDEX
+                            : Context::COMPARE_BUILTIN_INDEX;
+    int ncr;  // NaN compare result.
+    if (cc == lt || cc == le) {
+      ncr = GREATER;
     } else {
-      context_index = is_strong(strength())
-                          ? Context::COMPARE_STRONG_BUILTIN_INDEX
-                          : Context::COMPARE_BUILTIN_INDEX;
-      int ncr;  // NaN compare result.
-      if (cc == lt || cc == le) {
-        ncr = GREATER;
-      } else {
-        DCHECK(cc == gt || cc == ge);  // Remaining cases.
-        ncr = LESS;
-      }
-      __ li(a0, Operand(Smi::FromInt(ncr)));
-      __ push(a0);
+      DCHECK(cc == gt || cc == ge);  // Remaining cases.
+      ncr = LESS;
     }
+    __ li(a0, Operand(Smi::FromInt(ncr)));
+    __ push(a0);
 
     // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
     // tagged as a small integer.
     __ InvokeBuiltin(context_index, JUMP_FUNCTION);
   }
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
@@ skipping 4995 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS