Clean up JNI dlsym lookup trampoline.

Make sure the GenericJniTrampoline recognizes the trampoline
in primary boot image oat file. Rename that trampoline, add
a test and flag some issues in the code.

Test: New test 178-app-image-native-method.
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: testrunner.py --host -t 178-app-image-native-method
Bug: 112189621
Change-Id: I8f8cd11998af536fd3842dd4183a25f0367655a6
diff --git a/test/178-app-image-native-method/check b/test/178-app-image-native-method/check
new file mode 100755
index 0000000..5336295
--- /dev/null
+++ b/test/178-app-image-native-method/check
@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Filter out error messages for missing native methods.
+grep -v 'No implementation found for ' "$2" | diff -q "$1" - >/dev/null