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

src/ppc/macro-assembler-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_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 367 matching lines @@
   // Converts the unsigned integer (untagged smi) in |src| to
   // a double, storing the result to |double_dst|
   void ConvertUnsignedIntToDouble(Register src, DoubleRegister double_dst);
 
   // Converts the integer (untagged smi) in |src| to
   // a float, storing the result in |dst|
   // Warning: The value in |int_scrach| will be changed in the process!
   void ConvertIntToFloat(const DoubleRegister dst, const Register src,
                          const Register int_scratch);
 
+#if V8_TARGET_ARCH_PPC64
+  void ConvertInt64ToDouble(Register src, DoubleRegister double_dst);
+#endif
+
   // Converts the double_input to an integer.  Note that, upon return,
   // the contents of double_dst will also hold the fixed point representation.
   void ConvertDoubleToInt64(const DoubleRegister double_input,
 #if !V8_TARGET_ARCH_PPC64
                             const Register dst_hi,
 #endif
                             const Register dst, const DoubleRegister double_dst,
                             FPRoundingMode rounding_mode = kRoundToZero);
 
   // Generates function and stub prologue code.
@@ skipping 1168 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_