S390: Fix convertion from int32 to float32

src/compiler/s390/code-generator-s390.cc

 // Copyright 2015 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 1613 matching lines @@
         __ b(Condition(1), &conversion_done);  // special case
         __ LoadImmP(i.OutputRegister(1), Operand(1));
         __ bind(&conversion_done);
       }
 #endif
       break;
     }
     case kS390_Float32ToInt32: {
       bool check_conversion = (i.OutputCount() > 1);
       __ ConvertFloat32ToInt32(i.InputDoubleRegister(0), i.OutputRegister(0),
-                               kScratchDoubleReg);
+                               kScratchDoubleReg, kRoundToZero);
       if (check_conversion) {
         Label conversion_done;
         __ LoadImmP(i.OutputRegister(1), Operand::Zero());
         __ b(Condition(1), &conversion_done);  // special case
         __ LoadImmP(i.OutputRegister(1), Operand(1));
         __ bind(&conversion_done);
       }
       break;
     }
     case kS390_Float32ToUint32: {
@@ skipping 716 matching lines @@
       padding_size -= 2;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8