Revert "Revert "JIT JNI stubs.""

The original CL,
    https://android-review.googlesource.com/513417 ,
had a bug for class unloading where a read barrier was
executed at the wrong time from
    ConcurrentCopying::MarkingPhase() ->
    ClassLinker::CleanupClassLoaders() ->
    ClassLinker::DeleteClassLoader() ->
    JitCodeCache::RemoveMethodsIn() ->
    JitCodeCache::JniStubKey::UpdateShorty() ->
    ArtMethod::GetShorty().
This has been fixed by removing sources of the read barrier
from ArtMethod::GetShorty().

Test: testrunner.py --host --prebuild --jit --no-relocate \
      --no-image -t 998-redefine-use-after-free
Bug: 65574695
Bug: 69843562

This reverts commit 47d31853e16a95393d760e6be2ffeeb0193f94a1.

Change-Id: I06e7a15b09d9ff11cde15a7d1529644bfeca15e0
diff --git a/runtime/stack.h b/runtime/stack.h
index bd6204f..a16930b 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -140,8 +140,7 @@
   };
 
   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_;