[turbofan] Implemented the optional Float32RoundTiesEven operator.

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

 // Copyright 2014 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/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 794 matching lines @@
       break;
     case kArmVrintzF32:
       __ vrintz(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArmVrintzF64:
       __ vrintz(i.OutputFloat64Register(), i.InputFloat64Register(0));
       break;
     case kArmVrintaF64:
       __ vrinta(i.OutputFloat64Register(), i.InputFloat64Register(0));
       break;
+    case kArmVrintnF32:
+      __ vrintn(i.OutputFloat32Register(), i.InputFloat32Register(0));
+      break;
     case kArmVrintnF64:
       __ vrintn(i.OutputFloat64Register(), i.InputFloat64Register(0));
       break;
     case kArmVcvtF32F64: {
       __ vcvt_f32_f64(i.OutputFloat32Register(), i.InputFloat64Register(0));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     }
     case kArmVcvtF64F32: {
       __ vcvt_f64_f32(i.OutputFloat64Register(), i.InputFloat32Register(0));
@@ skipping 547 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8