PPC64: Implemented the RoundUint64ToFloat64 TurboFan operator.

src/ppc/assembler-ppc.cc

Index: src/ppc/assembler-ppc.cc
diff --git a/src/ppc/assembler-ppc.cc b/src/ppc/assembler-ppc.cc
index ac03ce6949ef25daaf5993e24df7663113491321..c471d244792fc2d33909b4a1364e148ae015f64c 100644
--- a/src/ppc/assembler-ppc.cc
+++ b/src/ppc/assembler-ppc.cc
@@ -2163,6 +2163,12 @@ void Assembler::fcfid(const DoubleRegister frt, const DoubleRegister frb,
 }
 
 
+void Assembler::fcfidu(const DoubleRegister frt, const DoubleRegister frb,
+                       RCBit rc) {
+  emit(EXT4 | FCFIDU | frt.code() * B21 | frb.code() * B11 | rc);
+}
+
+
 void Assembler::fcfids(const DoubleRegister frt, const DoubleRegister frb,
                        RCBit rc) {
   emit(EXT3 | FCFID | frt.code() * B21 | frb.code() * B11 | rc);