Add test for checking VarHandle CAS concurrency guarantees

Test: art/test/testrunner/testrunner.py -t 719-varhandle-concurrency
Bug: 208156527
Change-Id: I395ce6346331d43e16660d01499956270740f2e6
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 5ac2d14..ad8df10 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1175,6 +1175,9 @@
       "name": "art-run-test-718-zipfile-finalizer[com.google.android.art.apex]"
     },
     {
+      "name": "art-run-test-719-varhandle-concurrency[com.google.android.art.apex]"
+    },
+    {
       "name": "art-run-test-721-osr[com.google.android.art.apex]"
     },
     {
@@ -2464,6 +2467,9 @@
       "name": "art-run-test-718-zipfile-finalizer"
     },
     {
+      "name": "art-run-test-719-varhandle-concurrency"
+    },
+    {
       "name": "art-run-test-721-osr"
     },
     {