FIR checker: don't report errors on type parameter as LHS of class literals

If a type paramter is not reified or nullable, different errors will
be reported by FirGetClassCallChecker.

When determining whether type parameter wrapped in qualified access is a
standalone expression or not, we examine whether the checker context has
other qualified accesses in stack. Class literals (::class) is desugared
to FirGetClassCall, and thus not stacked as qualified access. Since
class literals are a special type of callable reference (a subtype of
qualified access), we should keep track of FirGetClassCall in a similar
way.

compiler/testData/diagnostics/tests/classLiteral/nonClassesOnLHS.fir.kt

@@ -9,8 +9,8 @@ val l1 = <!NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>List<String>?::class<!>
 val l2 = <!NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>List?::class<!>
 
 fun <T : Any> foo() {
-    val t1 = <!TYPE_PARAMETER_AS_REIFIED!><!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class<!>
-    val t2 = <!NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!><!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>?::class<!>
+    val t1 = <!TYPE_PARAMETER_AS_REIFIED!>T::class<!>
+    val t2 = <!NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>T?::class<!>
 }
 
 inline fun <reified T : Any> bar() {