[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1277 matching lines @@
         __ pop(input_reg);
       } else {
         __ fild_s(i.InputOperand(0));
       }
       break;
     }
     case kX87Float32ToFloat64: {
       InstructionOperand* input = instr->InputAt(0);
       if (input->IsDoubleRegister()) {
         __ sub(esp, Immediate(kDoubleSize));
-        __ fstp_d(MemOperand(esp, 0));
-        __ fld_d(MemOperand(esp, 0));
+        __ fstp_s(MemOperand(esp, 0));
+        __ fld_s(MemOperand(esp, 0));
         __ add(esp, Immediate(kDoubleSize));
       } else {
         DCHECK(input->IsDoubleStackSlot());
         if (FLAG_debug_code && FLAG_enable_slow_asserts) {
           __ VerifyX87StackDepth(1);
         }
         __ fstp(0);
         __ fld_s(i.InputOperand(0));
       }
       break;
@@ skipping 1094 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8