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/debugger.cc b/runtime/debugger.cc
index 328a9bb..3ad7fc9 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -60,6 +60,7 @@
 #include "mirror/class_loader.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_array-inl.h"
+#include "mirror/string-alloc-inl.h"
 #include "mirror/string-inl.h"
 #include "mirror/throwable.h"
 #include "nativehelper/scoped_local_ref.h"