PPC: [date] Refactor the %_DateField intrinsic to be optimizable.

src/ppc/lithium-ppc.cc

Index: src/ppc/lithium-ppc.cc
diff --git a/src/ppc/lithium-ppc.cc b/src/ppc/lithium-ppc.cc
index ffe3d2c654fd5a3c0aec5d55171332aed50b0d38..35b09f9973a9f15d397fc29b8522a40cfb621f1f 100644
--- a/src/ppc/lithium-ppc.cc
+++ b/src/ppc/lithium-ppc.cc
@@ -1815,7 +1815,7 @@ LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
   LOperand* object = UseFixed(instr->value(), r3);
   LDateField* result =
       new (zone()) LDateField(object, FixedTemp(r4), instr->index());
-  return MarkAsCall(DefineFixed(result, r3), instr, CAN_DEOPTIMIZE_EAGERLY);
+  return MarkAsCall(DefineFixed(result, r3), instr, CANNOT_DEOPTIMIZE_EAGERLY);
 }