$EXEC: double quotes are no longer correctly handled

FULL PRODUCT VERSION :
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b91)
Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b91, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.10240]

A DESCRIPTION OF THE PROBLEM :
An $EXEC command which contains double quotes, no longer works as expected. This is the case, both for escaped double quotes, and unescaped double quotes inside a single-quote string.

REGRESSION. Last worked in version 8u45

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
create a file test.js with the following content:
$EXEC("find \"host\"", "host"); // use escaped double quotes
print($OUT);
print($ERR);

$EXEC('find "host"', "host"); // use single quotes
print($OUT);
print($ERR);

and run it with the command on a Windows host (since the command uses the Windows-specific "find" tool):
jjs -scripting test.js

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Output is:
host

host

ACTUAL -
Output is:
FIND: Parameter format not correct

FIND: Parameter format not correct


REPRODUCIBILITY :
This bug can be reproduced always.