PPC64: Implemented the RoundInt64ToFloat32 TurboFan operator.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index fa973544be01613e00c54c393199cb2cc7c48a4c..47a238d25141ef47a0325e1b80758cceb59320a8 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -1081,6 +1081,10 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Move(i.OutputRegister(), i.InputRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
+    case kPPC_Int64ToFloat32:
+      __ ConvertInt64ToFloat(i.InputRegister(0), i.OutputDoubleRegister());
+      DCHECK_EQ(LeaveRC, i.OutputRCBit());
+      break;
     case kPPC_Int64ToDouble:
       __ ConvertInt64ToDouble(i.InputRegister(0), i.OutputDoubleRegister());
       DCHECK_EQ(LeaveRC, i.OutputRCBit());