target/mips: Drop redundant gen_io_start/stop()
DMTC0 CP0_Cause does a redundant gen_io_start() and gen_io_end() pair, even though this is done for all DMTC0 operations outside of the switch statement. Remove these redundant calls. Fixes: 5dc5d9f0 ("mips: more fixes to the MIPS interrupt glue logic") Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Yongbok Kim <yongbok.kim@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com>
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