Robustification: Always assign an environment to LModI when a deopt is possible.

src/x64/lithium-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1433 matching lines @@
       // The temporary operand is necessary to ensure that right is not
       // allocated into edx.
       LOperand* temp = FixedTemp(rdx);
       LOperand* value = UseFixed(instr->left(), rax);
       LOperand* divisor = UseRegister(instr->right());
       LModI* mod = new(zone()) LModI(value, divisor, temp);
       result = DefineFixed(mod, rdx);
     }
 
     return (instr->CheckFlag(HValue::kBailoutOnMinusZero) ||
-            instr->CheckFlag(HValue::kCanBeDivByZero))
+            instr->CheckFlag(HValue::kCanBeDivByZero) ||
+            instr->CheckFlag(HValue::kCanOverflow))
         ? AssignEnvironment(result)
         : result;
   } else if (instr->representation().IsTagged()) {
     return DoArithmeticT(Token::MOD, instr);
   } else {
     ASSERT(instr->representation().IsDouble());
     // We call a C function for double modulo. It can't trigger a GC.
     // We need to use fixed result register for the call.
     // TODO(fschneider): Allow any register as input registers.
     LOperand* left = UseFixedDouble(instr->left(), xmm2);
@@ skipping 1092 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64