X87: fix a check error for deoptimization.

src/compiler/x87/code-generator-x87.cc

 // Copyright 2013 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 "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 404 matching lines @@
     case kArchDeoptimize: {
       int deopt_state_id =
           BuildTranslation(instr, -1, 0, OutputFrameStateCombine::Ignore());
       int double_register_param_count = 0;
       int x87_layout = 0;
       for (size_t i = 0; i < instr->InputCount(); i++) {
         if (instr->InputAt(i)->IsDoubleRegister()) {
           double_register_param_count++;
         }
       }
-      // Currently we use only one X87 register. If we use more X87 register
-      // in the future. we need to generate the x87 layout according to the
-      // used double registers.
-      DCHECK(double_register_param_count < 2);
-      if (double_register_param_count == 1) {
+      // Currently we use only one X87 register. If double_register_param_count
+      // is bigger than 1, it means duplicated double register is added to input
+      // of this instruction.
+      if (double_register_param_count > 0) {
         x87_layout = (0 << 3) | 1;
       }
       // The layout of x87 register stack is loaded on the top of FPU register
       // stack for deoptimization.
       __ push(Immediate(x87_layout));
       __ fild_s(MemOperand(esp, 0));
       __ lea(esp, Operand(esp, kPointerSize));
 
       AssembleDeoptimizerCall(deopt_state_id, Deoptimizer::EAGER);
       break;
@@ skipping 1473 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8