target-mips: add privilege level check to several Cop0 instructions
The MIPS Architecture Verification Programs (AVPs) check privileged instructions for the required privilege level. These changes are needed to pass the AVP suite. Signed-off-by: NEric Johnson <ericj@mips.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> (cherry picked from commit 2e15497c) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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