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/declarationChecks/kClassInSignature.fir.kt

@@ -1,23 +1,23 @@
 // !DIAGNOSTICS: -TYPE_PARAMETER_AS_REIFIED -TYPE_PARAMETER_OF_PROPERTY_NOT_USED_IN_RECEIVER -UNUSED_VARIABLE -UNUSED_PARAMETER
 
-fun <T> test1() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
-fun <T : Any> test2() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
+fun <T> test1() = T::class
+fun <T : Any> test2() = T::class
 
-val <T> test3 = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
-val <T> test4 get() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
+val <T> test3 = T::class
+val <T> test4 get() = T::class
 
 fun <T> test5() = listOf(T::class)
 
-fun <T> test6(): kotlin.reflect.KClass<T> = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
-fun <T> test7(): kotlin.reflect.KClass<*> = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
+fun <T> test6(): kotlin.reflect.KClass<T> = T::class
+fun <T> test7(): kotlin.reflect.KClass<*> = T::class
 fun test8() = <!NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>String?::class<!>
 
 fun <T> listOf(e: T): List<T> = null!!
 
 fun <L> locals() {
-    fun <T> test1() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
-    fun <T : Any> test2() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>T<!>::class
+    fun <T> test1() = T::class
+    fun <T : Any> test2() = T::class
 
-    val test3 = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>L<!>::class
-    fun test4() = <!TYPE_PARAMETER_IS_NOT_AN_EXPRESSION!>L<!>::class
+    val test3 = L::class
+    fun test4() = L::class
 }