FIR checker: report val reassignment

compiler/tests-spec/testData/diagnostics/linked/declarations/property-declaration/local-property-declaration/p-1/neg/1.1.fir.kt

@@ -26,7 +26,7 @@ fun case1() {
 fun case2() {
     val x: Boolean = false
     try {
-        x = (throw Exception()) || true //VAL_REASSIGNMENT should be
+        <!VAL_REASSIGNMENT!>x<!> = (throw Exception()) || true //VAL_REASSIGNMENT should be
     } catch (e: Exception) {
     }
 }

compiler/tests-spec/testData/diagnostics/linked/statements/assignments/p-2/neg/1.1.fir.kt

@@ -9,12 +9,12 @@
 fun case1() {
     val x : Any
     x = "0"
-    x = 1
-    x = 2.0
+    <!VAL_REASSIGNMENT!>x<!> = 1
+    <!VAL_REASSIGNMENT!>x<!> = 2.0
 
     val y : Any = 0
-    y = "0"
-    y = 1.0
+    <!VAL_REASSIGNMENT!>y<!> = "0"
+    <!VAL_REASSIGNMENT!>y<!> = 1.0
 }
 
 /*
@@ -23,8 +23,8 @@ fun case1() {
  */
 fun case2() {
     val x : Any
-    mutableListOf(0).forEach({ x = it })
+    mutableListOf(0).forEach({ <!VAL_REASSIGNMENT!>x<!> = it })
 
     val y : Any = 1
-    mutableListOf(1).forEach({ y = it })
+    mutableListOf(1).forEach({ <!VAL_REASSIGNMENT!>y<!> = it })
 }