RFR(XS): 8147564: [JVMCI] remove unused method CodeCacheProvider.needsDataPatch

[Roland Schatz]

Hi,

Please review this small patch:
webrev: http://cr.openjdk.java.net/~rschatz/JDK-8147564/webrev.00/
jira: https://bugs.openjdk.java.net/browse/JDK-8147564

The removed method always returned false, because there is no class 
implementing both the JavaConstant and the HotSpotMetaspaceConstant 
interfaces.

Thanks,
Roland