Bug report: instanceof incompatible with mozilla_compat's importClass

[Tal Liron]

Example:

importClass(java.io.File)
x instanceof File
Will throw an exception:

nashorn:mozilla_compat.js:65:20 ReferenceError: File is not defined
    at 
jdk.nashorn.internal.scripts.Script$\=nashorn\!mozilla_compat._L47$_L51(nashorn:mozilla_compat.js:65)

However, this works:

x instanceof java.io.File