ART: Add string-alloc-inl.h

In an effort to reduce the (transitive) proliferation of heap-inl
add a specific inline header for string allocation.

Bug: 118385392
Test: mmma art
Test: m test-art-host
Change-Id: I68d3bcf2b3615d12231010940d0a24a1dbc03826
diff --git a/runtime/native/java_lang_StringFactory.cc b/runtime/native/java_lang_StringFactory.cc
index c6ad4e4..13f8d5b 100644
--- a/runtime/native/java_lang_StringFactory.cc
+++ b/runtime/native/java_lang_StringFactory.cc
@@ -20,7 +20,7 @@
 #include "handle_scope-inl.h"
 #include "jni/jni_internal.h"
 #include "mirror/object-inl.h"
-#include "mirror/string-inl.h"
+#include "mirror/string-alloc-inl.h"
 #include "native_util.h"
 #include "nativehelper/jni_macros.h"
 #include "nativehelper/scoped_local_ref.h"