MIPS: Use weak cells in map checks in polymorphic ICs.

src/mips64/macro-assembler-mips64.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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
@@ skipping 3982 matching lines @@
   li(match, Operand(cell));
   ld(match, FieldMemOperand(match, WeakCell::kValueOffset));
   Dsubu(match, value, match);
 }
 
 
 void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
                                    Label* miss) {
   li(value, Operand(cell));
   ld(value, FieldMemOperand(value, WeakCell::kValueOffset));
-  JumpIfNotSmi(value, miss);
+  JumpIfSmi(value, miss);
 }
 
 
 void MacroAssembler::MovFromFloatResult(const DoubleRegister dst) {
   if (IsMipsSoftFloatABI) {
     Move(dst, v0, v1);
   } else {
     Move(dst, f0);  // Reg f0 is o32 ABI FP return value.
   }
 }
@@ skipping 2311 matching lines @@
   }
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64