[13] RFR(XS): 8225706: JFR RootResolver resets CLD claims with no restore

[Markus Gronlund]

Greetings,

Kindly asking for reviews for the following changeset:

Bug: https://bugs.openjdk.java.net/browse/JDK-8225706 
Webrev: http://cr.openjdk.java.net/~mgronlun/8225706/webrev01/ 
Testing: test/jdk/:jdk_jfr

Summary:
We need to move SaveRestoreCLDClaimBits, from currently inside RootSetClosure::process_roots() back up to EmitEventOperation::doit() for proper scope.
RootResolver::resolve() clears out already set claim bits via ClassLoaderDataGraph::clear_claimed_marks() under the (currently false) premise that the original claims will be restored later.
The problematic path triggers only if the option "path-to-gc-roots=true" is set via the command-line or via jcmd AND an existing old object candidate is found.

Thanks to Stefan Karlsson for calling attention to this.

Thank you
Markus