[FIR] Don't lose flexible types during capturing from expression

compiler/testData/diagnostics/tests/generics/projectionsScope/platformSuperClass.fir.kt

@@ -1,22 +0,0 @@
-// !CHECK_TYPE
-
-// FILE: Clazz.java
-public class Clazz<T> {
-    public T getT() { return null; }
-    public Clazz<? super T> getSuperClass() { return null; }
-}
-
-// FILE: main.kt
-fun test(clazz: Clazz<*>) {
-    clazz.t checkType { _<Any?>() }
-    clazz.getSuperClass() checkType { <!UNRESOLVED_REFERENCE_WRONG_RECEIVER!>_<!><Clazz<*>?>() }
-    clazz.getSuperClass().t checkType { _<Any?>() }
-
-    clazz.superClass checkType { <!UNRESOLVED_REFERENCE_WRONG_RECEIVER!>_<!><Clazz<*>?>() }
-    clazz.superClass.t checkType { _<Any?>() }
-
-    // See KT-9294
-    if (clazz.superClass == null) {
-        throw NullPointerException()
-    }
-}

compiler/testData/diagnostics/tests/generics/projectionsScope/platformSuperClass.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !CHECK_TYPE
 
 // FILE: Clazz.java