PPC/s390: Make explicit that RelocInfo's target_object is always a HeapObject.

src/ppc/assembler-ppc-inl.h

Index: src/ppc/assembler-ppc-inl.h
diff --git a/src/ppc/assembler-ppc-inl.h b/src/ppc/assembler-ppc-inl.h
index 216650c2f4fe45a0f962710178202f85bf243393..80083487132df3d52f0ed483562971d60a79f72c 100644
--- a/src/ppc/assembler-ppc-inl.h
+++ b/src/ppc/assembler-ppc-inl.h
@@ -175,20 +175,19 @@ Address Assembler::return_address_from_call_start(Address pc) {
   return pc + (len + 2) * kInstrSize;
 }
 
-Object* RelocInfo::target_object() {
+HeapObject* RelocInfo::target_object() {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return reinterpret_cast<Object*>(Assembler::target_address_at(pc_, host_));
+  return HeapObject::cast(
+      reinterpret_cast<Object*>(Assembler::target_address_at(pc_, host_)));
 }
 
-
-Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
+Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return Handle<Object>(
-      reinterpret_cast<Object**>(Assembler::target_address_at(pc_, host_)));
+  return Handle<HeapObject>(
+      reinterpret_cast<HeapObject**>(Assembler::target_address_at(pc_, host_)));
 }
 
-
-void RelocInfo::set_target_object(Object* target,
+void RelocInfo::set_target_object(HeapObject* target,
                                   WriteBarrierMode write_barrier_mode,
                                   ICacheFlushMode icache_flush_mode) {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
@@ -266,10 +265,9 @@ static const int kCodeAgingTargetDelta = 1 * Assembler::kInstrSize;
 static const int kNoCodeAgeSequenceLength =
     (kNoCodeAgeSequenceInstructions * Assembler::kInstrSize);
 
-
-Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
+Handle<Code> RelocInfo::code_age_stub_handle(Assembler* origin) {
   UNREACHABLE();  // This should never be reached on PPC.
-  return Handle<Object>();
+  return Handle<Code>();
 }