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/generics/tpAsReified/ClassDereference.fir.kt

@@ -1,3 +0,0 @@
-
-fun <T: Any> dereferenceClass(): Any =
-        <!TYPE_PARAMETER_AS_REIFIED!><!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class<!>

compiler/testData/diagnostics/tests/generics/tpAsReified/ClassDereference.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 
 fun <T: Any> dereferenceClass(): Any =
         <!TYPE_PARAMETER_AS_REIFIED!>T::class<!>