FIR checker: report SUPERTYPE_NOT_INITIALIZED

Combined this and the checker of
SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR together.

Also fixed SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR incorrectly
repoted as warning instead of error.

compiler/testData/diagnostics/tests/controlFlowAnalysis/definiteReturn/simpleClass.fir.kt

@@ -10,10 +10,10 @@ package test.p; class C {fun f() {}}
 package test.p; open class G<T> {open fun f(): T {} fun a() {}}
 
 // FILE: d.kt
-package test.p; class G2<E> : G<E> { fun g() : E {} override fun f() : E {}}
+package test.p; class G2<E> : <!SUPERTYPE_NOT_INITIALIZED!>G<E><!> { fun g() : E {} override fun f() : E {}}
 
 // FILE: e.kt
 package test.p; fun foo() {}
 
 // FILE: f.kt
-package test.p; fun foo(a: C) {}
+package test.p; fun foo(a: C) {}