Fix test - read variable for reproduce KT-3273 fail condition

#KT-3273 Fixed

compiler/testData/codegen/regressions/kt3273.kt

@@ -1,14 +1,18 @@
+fun printlnMock(a: Any) {}
+
 public fun testCoalesce() {
-   val value: String = when {
+    val value: String = when {
-       true -> {
+        true -> {
-          if (true) {
+            if (true) {
-             "foo"
+                "foo"
-          } else {
+            } else {
-             "bar"
+                "bar"
-          }
+            }
-       }
+        }
-       else -> "Hello world"
+        else -> "Hello world"
     }
+
+    printlnMock(value.length)
 }
 
 fun box(): String {