Write is_unsigned flag into metadata for an annotation arguments

Instead of adding new kind of types, we'll use flag to disambiguate
 usual types from unsigned ones, this approach has two advantages:
 - less changes in the metadata format
 - it allows naturally extend format for unsigned arrays,
  which will be supported later

 #KT-25310 Fixed
 #KT-25273 Fixed

compiler/tests/org/jetbrains/kotlin/codegen/CompileKotlinAgainstKotlinTestGenerated.java

@@ -272,4 +272,9 @@ public class CompileKotlinAgainstKotlinTestGenerated extends AbstractCompileKotl
     public void testTypeAliasesKt13181() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/typeAliasesKt13181.kt");
     }
+
+    @TestMetadata("unsignedTypesInAnnotations.kt")
+    public void testUnsignedTypesInAnnotations() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/unsignedTypesInAnnotations.kt");
+    }
 }