Refactor some patching logic

Reduce duplication since app images in-place relocation will require
this code also.

Bug: 22858531
Change-Id: Ibb901b67267e27ef3bc2a0baff77189d4dcd018a
diff --git a/runtime/mirror/dex_cache-inl.h b/runtime/mirror/dex_cache-inl.h
index f8ccfb1..975af61 100644
--- a/runtime/mirror/dex_cache-inl.h
+++ b/runtime/mirror/dex_cache-inl.h
@@ -137,6 +137,32 @@
   }
 }
 
+template <typename Visitor>
+inline void DexCache::FixupStrings(GcRoot<mirror::String>* dest, const Visitor& visitor) {
+  GcRoot<mirror::String>* src = GetStrings();
+  for (size_t i = 0, count = NumStrings(); i < count; ++i) {
+    // TODO: Probably don't need read barrier for most callers.
+    mirror::String* source = src[i].Read();
+    mirror::String* new_source = visitor(source);
+    if (source != new_source) {
+      dest[i] = GcRoot<mirror::String>(new_source);
+    }
+  }
+}
+
+template <typename Visitor>
+inline void DexCache::FixupResolvedTypes(GcRoot<mirror::Class>* dest, const Visitor& visitor) {
+  GcRoot<mirror::Class>* src = GetResolvedTypes();
+  for (size_t i = 0, count = NumResolvedTypes(); i < count; ++i) {
+    // TODO: Probably don't need read barrier for most callers.
+    mirror::Class* source = src[i].Read();
+    mirror::Class* new_source = visitor(source);
+    if (source != new_source) {
+      dest[i] = GcRoot<mirror::Class>(new_source);
+    }
+  }
+}
+
 }  // namespace mirror
 }  // namespace art