[turbofan] Implemented the optional Float32RoundTruncate 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 785 matching lines @@
       break;
     case kArmVrintmF64:
       __ vrintm(i.OutputFloat64Register(), i.InputFloat64Register(0));
       break;
     case kArmVrintpF32:
       __ vrintp(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArmVrintpF64:
       __ vrintp(i.OutputFloat64Register(), i.InputFloat64Register(0));
       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 kArmVrintnF64:
       __ vrintn(i.OutputFloat64Register(), i.InputFloat64Register(0));
       break;
     case kArmVcvtF32F64: {
@@ skipping 553 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8