Dead var statement evacuation incorrectly descends into nested functions

FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) Client VM (build 25.60-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.3.9600]

A DESCRIPTION OF THE PROBLEM :
While executing a JavaScript code with nashorn executable (jjs.exe), an exception is thrown.

Probably it caused by a dead code elimination while pre-processing the JavaScript file.

This bug might be related to previously reported bug (reported by me few days ago, JI-9023716).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
save the attaches source code as program.js and run in windows command:
jjs.exe program.js

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
in
out
ACTUAL -
in
Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.runtime.Undefined to jdk.nashorn.internal.runtime.ScriptFunction
        at java.lang.invoke.MethodHandleImpl.newClassCastException(Unknown Source)
        at java.lang.invoke.MethodHandleImpl.castReference(Unknown Source)
        at jdk.nashorn.internal.scripts.Script$code.:program(code.js:11)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:640)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:228)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
        at jdk.nashorn.tools.Shell.apply(Shell.java:397)
        at jdk.nashorn.tools.Shell.runScripts(Shell.java:326)
        at jdk.nashorn.tools.Shell.run(Shell.java:172)
        at jdk.nashorn.tools.Shell.main(Shell.java:136)
        at jdk.nashorn.tools.Shell.main(Shell.java:112)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.runtime.Undefined to jdk.nashorn.internal.runtime.ScriptFunction
        at java.lang.invoke.MethodHandleImpl.newClassCastException(Unknown Source)
        at java.lang.invoke.MethodHandleImpl.castReference(Unknown Source)
        at jdk.nashorn.internal.scripts.Script$code.:program(code.js:11)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:640)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:228)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
        at jdk.nashorn.tools.Shell.apply(Shell.java:397)
        at jdk.nashorn.tools.Shell.runScripts(Shell.java:326)
        at jdk.nashorn.tools.Shell.run(Shell.java:172)
        at jdk.nashorn.tools.Shell.main(Shell.java:136)
        at jdk.nashorn.tools.Shell.main(Shell.java:112)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
print("in");
var v1;

function f1()
{
v1 = 1;
return true;
(function () { var v1; })();
}

f1();
print("out");
---------- END SOURCE ----------