Move `art_standalone_dexpreopt_tests` to the top-level TEST_MAPPING.

Generated Blueprint files for 656 ART run-tests out of 946 (69%).
Generated TEST_MAPPING entries for 403 ART run-tests out of 946 (42%):
  403 ART run-tests (100%) in `mainline-presubmit` test group.
   18 ART gtests (94%) in `mainline-presubmit` test group.
  403 ART run-tests (100%) in `presubmit` test group.
   19 ART gtests (100%) in `presubmit` test group.
    0 ART run-tests (0%) in `postsubmit` test group.

Bug: 201491591
Test: Presubmits
Change-Id: I53c167bcaf3fe99f8a6119d0ff89e89442860018
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 53c8a42..18a4406 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1285,6 +1285,9 @@
       "name": "ComposHostTestCases"
     },
     {
+      "name": "art_standalone_dexpreopt_tests"
+    },
+    {
       "name": "art-run-test-001-HelloWorld"
     },
     {
diff --git a/test/dexpreopt/TEST_MAPPING b/test/dexpreopt/TEST_MAPPING
deleted file mode 100644
index 3075987..0000000
--- a/test/dexpreopt/TEST_MAPPING
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "art_standalone_dexpreopt_tests"
-    }
-  ]
-}
diff --git a/test/utils/regen-test-files b/test/utils/regen-test-files
index 719196d..3302941 100755
--- a/test/utils/regen-test-files
+++ b/test/utils/regen-test-files
@@ -473,6 +473,7 @@
         "BootImageProfileTest",
         "ArtServiceTests",
         "ComposHostTestCases",
+        "art_standalone_dexpreopt_tests",
     ]
     presubmit_tests = other_presubmit_tests + run_test_module_names + art_gtest_module_names
     presubmit_tests_dict = [{"name": t} for t in presubmit_tests]