RFR: 8169201: Montgomery multiply intrinsic should use correct name

[Rahul Raghavan]

Hi,

Please review following minor patch to solve the stubName typo fix -
Corrected stubName to montgomery_multiply for inline_montgomeryMultiply().

<jbs> - https://bugs.openjdk.java.net/browse/JDK-8169201
<webrev> - http://cr.openjdk.java.net/~rraghavan/8169201/webrev.00/

Thanks,
Rahul