PPC: [for-in] Sanitize for-in optimizations and fix bailout points.

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 81f3f9f7e9cca13a044e50602a7519b76f0d7572..ca466d77ebc1221d1d1bc19950cfd5e6f1370a0f 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -3375,7 +3375,8 @@ void MacroAssembler::LoadAccessor(Register dst, Register holder,
 }
 
 
-void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) {
+void MacroAssembler::CheckEnumCache(Label* call_runtime) {
+  Register null_value = r8;
   Register empty_fixed_array_value = r9;
   LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex);
   Label next, start;
@@ -3389,6 +3390,7 @@ void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) {
   CmpSmiLiteral(r6, Smi::FromInt(kInvalidEnumCacheSentinel), r0);
   beq(call_runtime);
 
+  LoadRoot(null_value, Heap::kNullValueRootIndex);
   b(&start);
 
   bind(&next);