PPC64: Implemented the RoundInt64ToFloat32 TurboFan operator.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 8eb352bb1062fd965a1a1b66c2268eb9e0fff612..e543ba853bc00767d8c19d0cae27ed9aa5566294 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -659,8 +659,7 @@ void MacroAssembler::ConvertIntToFloat(const DoubleRegister dst,
                                        const Register src,
                                        const Register int_scratch) {
   MovIntToDouble(dst, src, int_scratch);
-  fcfid(dst, dst);
-  frsp(dst, dst);
+  fcfids(dst, dst);
 }
 
 
@@ -670,6 +669,13 @@ void MacroAssembler::ConvertInt64ToDouble(Register src,
   MovInt64ToDouble(double_dst, src);
   fcfid(double_dst, double_dst);
 }
+
+
+void MacroAssembler::ConvertInt64ToFloat(Register src,
+                                         DoubleRegister double_dst) {
+  MovInt64ToDouble(double_dst, src);
+  fcfids(double_dst, double_dst);
+}
 #endif