[FIR] Report VAL_REASSIGNMENT on assign to non-local vals

In this commit reporting on member properties in init section of class
  is not supported (see KT-55528)

^KT-55493 Fixed

compiler/tests-spec/testData/diagnostics/linked/expressions/prefix-expressions/prefix-decrement-expression/p-4/neg/1.1.fir.kt

@@ -26,7 +26,7 @@ class Case1() {
 
 fun case2() {
     var b= Case2()
-    --b.a
+    --b.<!VAL_REASSIGNMENT!>a<!>
 }
 
 class Case2() {

compiler/tests-spec/testData/diagnostics/linked/expressions/prefix-expressions/prefix-increment-expression/p-4/neg/1.1.fir.kt

@@ -26,7 +26,7 @@ class Case1() {
 
 fun case2() {
     var b= Case2()
-    ++b.a
+    ++b.<!VAL_REASSIGNMENT!>a<!>
 }
 
 class Case2() {