PPC: Optimize the typeof operator.

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 fd2cc44cec08aaebfa8aa094f146e08c017acecf..db6cfb20515ac9be56ccf8ac86247a4f543c0ccc 100644
--- a/src/ppc/lithium-ppc.cc
+++ b/src/ppc/lithium-ppc.cc
@@ -2500,7 +2500,8 @@ LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
 
 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LTypeof* result = new (zone()) LTypeof(context, UseFixed(instr->value(), r3));
+  LOperand* value = UseFixed(instr->value(), r6);
+  LTypeof* result = new (zone()) LTypeof(context, value);
   return MarkAsCall(DefineFixed(result, r3), instr);
 }