Remove variables with empty ranges from local vars table

As their ranges may intersect after dead code elimination that leads to VerifyError

compiler/testData/codegen/box/deadCodeElimination/intersectingVariableRange.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    try {
+        return "OK"
+        if (1 == 1) {
+            val z = 2
+        }
+        if (3 == 3) {
+            val z = 4
+        }
+    } finally {
+
+    }
+}