Create From Usage: Do not suggest "val" for references used as assignment left-hand side

compiler/frontend/src/org/jetbrains/jet/lang/psi/psiUtil/jetPsiUtil.kt

@@ -345,4 +345,9 @@ public fun PsiElement.siblings(forward: Boolean = true, withItself: Boolean = tr
 public fun PsiElement.parents(withItself: Boolean = true): Stream<PsiElement> {
     val stream = stream(this) { if (it is PsiFile) null else it.getParent() }
     return if (withItself) stream else stream.drop(1)
+}
+
+public fun JetExpression.getAssignmentByLHS(): JetBinaryExpression? {
+    val parent = getParent() as? JetBinaryExpression ?: return null
+    return if (JetPsiUtil.isAssignment(parent) && parent.getLeft() == this) parent else null
 }