RFR(XS): 8209915: Fix license headers

[Mikael Vidstedt]

Please review this small change which fixes the license headers in three files:

src/hotspot/share/memory/metaspace/virtualSpaceList.cpp 
src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodDataAccessor.java 
src/jdk.jfr/share/classes/jdk/jfr/internal/OldObjectSample.java 

Bug: https://bugs.openjdk.java.net/browse/JDK-8209915
Webrev: http://cr.openjdk.java.net/~mikael/webrevs/8209915/webrev.00/open/webrev/

Cheers,
Mikael