Refactor how embedded pointers are visited.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
diff --git a/src/x64/assembler-x64-inl.h b/src/x64/assembler-x64-inl.h
index fabaf259b31209e3887343a3be8a0bdfca3a220c..10f0b886da57d37638400c3fc3df9d402dc6df07 100644
--- a/src/x64/assembler-x64-inl.h
+++ b/src/x64/assembler-x64-inl.h
@@ -388,7 +388,7 @@ Object** RelocInfo::call_object_address() {
 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
-    visitor->VisitEmbeddedPointer(host(), target_object_address());
+    visitor->VisitEmbeddedPointer(this);
     CPU::FlushICache(pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
@@ -416,7 +416,7 @@ template<typename StaticVisitor>
 void RelocInfo::Visit(Heap* heap) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
-    StaticVisitor::VisitEmbeddedPointer(heap, host(), target_object_address());
+    StaticVisitor::VisitEmbeddedPointer(heap, this);
     CPU::FlushICache(pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTarget(mode)) {
     StaticVisitor::VisitCodeTarget(heap, this);