Revert "JIT JNI stubs."

Seems to break 998-redefine-use-after-free in
some --no-image configuration.

Bug: 65574695
Bug: 69843562

This reverts commit 3417eaefe4e714c489a6fb0cb89b4810d81bdf4d.

Change-Id: I2dd157b931c17c791522ea2544c1982ed3519b86
diff --git a/runtime/stack.h b/runtime/stack.h
index a16930b..bd6204f 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -140,7 +140,8 @@
   };
 
   template <CountTransitions kCount = CountTransitions::kYes>
-  void WalkStack(bool include_transitions = false) REQUIRES_SHARED(Locks::mutator_lock_);
+  void WalkStack(bool include_transitions = false)
+      REQUIRES_SHARED(Locks::mutator_lock_);
 
   Thread* GetThread() const {
     return thread_;