KT-1273 Unused assignment - should highlight assignment instead of expression

#KT-1273 Fixed

compiler/testData/diagnostics/tests/UnusedVariables.kt

@@ -2,14 +2,14 @@ package unused_variables
 
 fun testSimpleCases() {
     var i = <!VARIABLE_WITH_REDUNDANT_INITIALIZER!>2<!>
-    i = <!UNUSED_VALUE!>34<!>
+    <!UNUSED_VALUE!>i =<!> 34
     i = 34
     doSmth(i)
-    i = <!UNUSED_VALUE!>5<!>
+    <!UNUSED_VALUE!>i =<!> 5
 
     var j = 2
     j = <!UNUSED_CHANGED_VALUE!>j++<!>
-    j = <!UNUSED_VALUE, UNUSED_CHANGED_VALUE!>j--<!>
+    <!UNUSED_VALUE!>j =<!> <!UNUSED_CHANGED_VALUE!>j--<!>
 }
 
 class IncDec() {
@@ -27,14 +27,14 @@ class MyTest() {
       x = <!UNUSED_CHANGED_VALUE!>x++<!>
       x = <!UNUSED_CHANGED_VALUE!>x--<!>
       x = ++x
-      x = <!UNUSED_VALUE!>--x<!>
+      <!UNUSED_VALUE!>x =<!> --x
     }
 
     var a: String = "s"
         set(v: String) {
             var i: Int = 23
             doSmth(i)
-            i = <!UNUSED_VALUE!>34<!>
+            <!UNUSED_VALUE!>i =<!> 34
             $a = v
         }
 
@@ -46,8 +46,8 @@ class MyTest() {
         a = "rro"
 
         var <!ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE!>i<!> = 1;
-        i = <!UNUSED_VALUE!>34<!>;
-        i = <!UNUSED_VALUE!>456<!>;
+        <!UNUSED_VALUE!>i =<!> 34;
+        <!UNUSED_VALUE!>i =<!> 456;
     }
 
     fun testWhile() {
@@ -57,7 +57,7 @@ class MyTest() {
             a = null
         }
         while (b != null) {
-            a = <!UNUSED_VALUE!>null<!>
+            <!UNUSED_VALUE!>a =<!> null
         }
     }
 
@@ -73,10 +73,10 @@ class MyTest() {
         doSmth(a)
 
         if (1 < 2) {
-            a = <!UNUSED_VALUE!>23<!>
+            <!UNUSED_VALUE!>a =<!> 23
         }
         else {
-            a = <!UNUSED_VALUE!>"ss"<!>
+            <!UNUSED_VALUE!>a =<!> "ss"
         }
     }