PPC: [turbofan] Added the RoundInt64ToFloat64 instruction to TurboFan.

src/compiler/ppc/instruction-codes-ppc.h

 // 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.
 
 #ifndef V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_
 #define V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 58 matching lines @@
   V(PPC_Tst32)                     \
   V(PPC_Tst64)                     \
   V(PPC_Push)                      \
   V(PPC_PushFrame)                 \
   V(PPC_StoreToStackSlot)          \
   V(PPC_ExtendSignWord8)           \
   V(PPC_ExtendSignWord16)          \
   V(PPC_ExtendSignWord32)          \
   V(PPC_Uint32ToUint64)            \
   V(PPC_Int64ToInt32)              \
+  V(PPC_Int64ToDouble)             \
   V(PPC_Int32ToDouble)             \
   V(PPC_Uint32ToDouble)            \
   V(PPC_Float32ToDouble)           \
   V(PPC_DoubleToInt32)             \
   V(PPC_DoubleToUint32)            \
   V(PPC_DoubleToFloat32)           \
   V(PPC_DoubleExtractLowWord32)    \
   V(PPC_DoubleExtractHighWord32)   \
   V(PPC_DoubleInsertLowWord32)     \
   V(PPC_DoubleInsertHighWord32)    \
@@ skipping 34 matching lines @@
 // MRR = [register + register]
 #define TARGET_ADDRESSING_MODE_LIST(V) \
   V(MRI) /* [%r0 + K] */               \
   V(MRR) /* [%r0 + %r1] */
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_