RFR (XS) JDK-8025569: -XX:+CheckUnhandledOops crashes on Windows

[Lois Foltan]

Please review the following fix:

Webrev:
     http://cr.openjdk.java.net/~coleenp/bug_jdk8025569/

Bug: -XX:+CheckUnhandledOops crashes on Windows
https://bugs.openjdk.java.net/browse/JDK-8025569

Summary of fix:
     Until JDK-8024364, 
<https://bugs.openjdk.java.net/browse/JDK-8024364> (Win/x64: 
os::current_frame() and os::fetch_frame_from_context() returns wrong 
frame pointer),
     is fixed, -XX:+CheckUnhandledOops can not be supported for Windows 
fastdebug builds due to the need to have
     a legitimate frame returned from os::current_frame() early on in 
universe_post_init() to register & deregister oops.

Tests:
         JTREG on Windows (in progress)

Thank you, Lois

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