[turbofan] Implemented the optional Float32RoundTruncate operator.

src/compiler/instruction-selector.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/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 913 matching lines @@
     case IrOpcode::kFloat64LessThanOrEqual:
       return VisitFloat64LessThanOrEqual(node);
     case IrOpcode::kFloat32RoundDown:
       return MarkAsFloat32(node), VisitFloat32RoundDown(node);
     case IrOpcode::kFloat64RoundDown:
       return MarkAsFloat64(node), VisitFloat64RoundDown(node);
     case IrOpcode::kFloat32RoundUp:
       return MarkAsFloat32(node), VisitFloat32RoundUp(node);
     case IrOpcode::kFloat64RoundUp:
       return MarkAsFloat64(node), VisitFloat64RoundUp(node);
+    case IrOpcode::kFloat32RoundTruncate:
+      return MarkAsFloat32(node), VisitFloat32RoundTruncate(node);
     case IrOpcode::kFloat64RoundTruncate:
       return MarkAsFloat64(node), VisitFloat64RoundTruncate(node);
     case IrOpcode::kFloat64RoundTiesAway:
       return MarkAsFloat64(node), VisitFloat64RoundTiesAway(node);
     case IrOpcode::kFloat64RoundTiesEven:
       return MarkAsFloat64(node), VisitFloat64RoundTiesEven(node);
     case IrOpcode::kFloat64ExtractLowWord32:
       return MarkAsWord32(node), VisitFloat64ExtractLowWord32(node);
     case IrOpcode::kFloat64ExtractHighWord32:
       return MarkAsWord32(node), VisitFloat64ExtractHighWord32(node);
@@ skipping 515 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8