8134898: Small fixes found during JVMCI work
Summary: Removed jre/ from jdk paths in makefiles. Add Thread::_unhandled_oops field for debug and fastdebug builds. Fix doc.
Reviewed-by: coleenp, bdelsart

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

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