[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/arm64/code-generator-arm64.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/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 1024 matching lines @@
       break;
     case kArm64Float64Sqrt:
       __ Fsqrt(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float32ToFloat64:
       __ Fcvt(i.OutputDoubleRegister(), i.InputDoubleRegister(0).S());
       break;
     case kArm64Float64ToFloat32:
       __ Fcvt(i.OutputDoubleRegister().S(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float32ToInt32:
+      __ Fcvtzs(i.OutputRegister32(), i.InputFloat32Register(0));
+      break;
     case kArm64Float64ToInt32:
       __ Fcvtzs(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64ToUint32:
       __ Fcvtzu(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Float32ToInt64:
       __ Fcvtzs(i.OutputRegister64(), i.InputFloat32Register(0));
       if (i.OutputCount() > 1) {
         __ Mov(i.OutputRegister(1), 1);
@@ skipping 585 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8