Run memunreachable_unit_test on bionic changes.

Bug: 137795072

Test: Ran atest.
Change-Id: I2153b3fd97f77bb06e9d66b5f5419cab0cbabcab
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 1d652f7..7aeb09e 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -8,6 +8,9 @@
     },
     {
       "name": "malloc_hooks_system_tests"
+    },
+    {
+      "name": "memunreachable_unit_test"
     }
   ]
 }