ART: Forward-declare Context

Move deletion to thread.cc, which allows to forward-declare
Context.

Bug: 119869270
Test: mmma art
Change-Id: Ifd9006cd3457d4ab708a289a7f6e1cdf2591c596
diff --git a/openjdkjvmti/ti_method.cc b/openjdkjvmti/ti_method.cc
index 7d69c89..e88539f 100644
--- a/openjdkjvmti/ti_method.cc
+++ b/openjdkjvmti/ti_method.cc
@@ -33,6 +33,7 @@
 
 #include <type_traits>
 
+#include "arch/context.h"
 #include "art_jvmti.h"
 #include "art_method-inl.h"
 #include "base/enums.h"