PPC: [turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

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 385 matching lines @@
 
   // 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);
 
+#if V8_TARGET_ARCH_PPC64
+  // Converts the double_input to an unsigned integer.  Note that, upon return,
+  // the contents of double_dst will also hold the fixed point representation.
+  void ConvertDoubleToUnsignedInt64(
+      const DoubleRegister double_input, const Register dst,
+      const DoubleRegister double_dst,
+      FPRoundingMode rounding_mode = kRoundToZero);
+#endif
+
   // Generates function and stub prologue code.
   void StubPrologue(int prologue_offset = 0);
   void Prologue(bool code_pre_aging, int prologue_offset = 0);
 
   // Enter exit frame.
   // stack_space - extra stack space, used for parameters before call to C.
   // At least one slot (for the return address) should be provided.
   void EnterExitFrame(bool save_doubles, int stack_space = 1);
 
   // Leave the current exit frame. Expects the return value in r0.
@@ skipping 1158 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_