VMX: VMentry failure with debug exceptions and blocked states

ISSUE DESCRIPTION Please see XSA-260 for background on the MovSS shadow: http://xenbits.xen.org/xsa/advisory-260.html Please see XSA-156 for background on the need for DB interception: http://xenbits.xen.org/xsa/advisory-156.html The VMX VMEntry checks does not like the exact combination of state...