Add test on experimental const val in annotation argument

This test checks that a usage inside an annotation argument is a
signature usage, which may be too restricting but easier to support at
the moment (and the restriction can be lifted in the future)

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestWithStdLibGenerated.java

@@ -1839,6 +1839,12 @@ public class DiagnosticsTestWithStdLibGenerated extends AbstractDiagnosticsTestW
             doTest(fileName);
         }
 
+        @TestMetadata("constVal.kt")
+        public void testConstVal() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithStdLib/experimental/constVal.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("deeplyNestedClass.kt")
         public void testDeeplyNestedClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithStdLib/experimental/deeplyNestedClass.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsTestWithStdLibUsingJavacGenerated.java

@@ -1839,6 +1839,12 @@ public class DiagnosticsTestWithStdLibUsingJavacGenerated extends AbstractDiagno
             doTest(fileName);
         }
 
+        @TestMetadata("constVal.kt")
+        public void testConstVal() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithStdLib/experimental/constVal.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("deeplyNestedClass.kt")
         public void testDeeplyNestedClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithStdLib/experimental/deeplyNestedClass.kt");