[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/declarationChecks/packageDeclarationModifiers.fir.kt

@@ -0,0 +1,12 @@
+package d
+
+abstract val a : Int = 1
+
+override val c : Int = 1
+
+final fun foo() = 2
+
+abstract fun baz() = 2
+
+class T {}
+override fun T.bar() = 2