GC-independent image layout.

Make sure we visit objects in a defined order, independent
of their order in the heap. The new order depends only on
dex file contents and contents of initialized classes,
thus any non-determinism would have to be contributed by
the class initialization itself rather than GC.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: aosp_taimen-userdebug boots.
Test: run-gtests.sh
Test: testrunner.py --target --optimizing
Bug: 26687569
Change-Id: I62521322289a22eb13faae526ba2c3589e6ab381
diff --git a/runtime/intern_table.cc b/runtime/intern_table.cc
index 3f728cb..96f70d1 100644
--- a/runtime/intern_table.cc
+++ b/runtime/intern_table.cc
@@ -289,6 +289,11 @@
   return Insert(s, true, false);
 }
 
+ObjPtr<mirror::String> InternTable::InternWeak(const char* utf8_data) {
+  DCHECK(utf8_data != nullptr);
+  return InternWeak(mirror::String::AllocFromModifiedUtf8(Thread::Current(), utf8_data));
+}
+
 ObjPtr<mirror::String> InternTable::InternWeak(ObjPtr<mirror::String> s) {
   return Insert(s, false, false);
 }