[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.

src/compiler/ppc/code-generator-ppc.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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1176 matching lines @@
       __ ConvertUnsignedInt64ToFloat(i.InputRegister(0),
                                      i.OutputDoubleRegister());
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     case kPPC_Uint64ToDouble:
       __ ConvertUnsignedInt64ToDouble(i.InputRegister(0),
                                       i.OutputDoubleRegister());
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
 #endif
+    case kPPC_Int32ToFloat32:
+      __ ConvertIntToFloat(i.OutputDoubleRegister(), i.InputRegister(0),
+                           kScratchReg);
+      DCHECK_EQ(LeaveRC, i.OutputRCBit());
+      break;
     case kPPC_Int32ToDouble:
       __ ConvertIntToDouble(i.InputRegister(0), i.OutputDoubleRegister());
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     case kPPC_Uint32ToDouble:
       __ ConvertUnsignedIntToDouble(i.InputRegister(0),
                                     i.OutputDoubleRegister());
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     case kPPC_DoubleToInt32:
@@ skipping 638 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8