RFR: JDK-8156584: Initialization race in sun.security.x509.AlgorithmId.get

[Martin Buchholz]

https://bugs.openjdk.java.net/browse/JDK-8156584
http://cr.openjdk.java.net/~martin/webrevs/openjdk8/AlgorithmId-get-race/

I'm not a crypto engineer, so I'm hoping someone on security-dev
adopts this fix.  But current webrev is intended to be a complete fix
for jdk8.