exu: fix debug isPerfCnt connection

* PerfCnt related inst run in csr should assign isPerfCnt as true

src/main/scala/xiangshan/backend/exu/ExeUnit.scala

@@ -148,6 +148,7 @@ class ExeUnitImp(
 
   // debug info
   io.out.bits.debug     := 0.U.asTypeOf(io.out.bits.debug)
+  io.out.bits.debug.isPerfCnt := funcUnits.map(_.io.csrio.map(_.isPerfCnt)).map(_.getOrElse(false.B)).reduce(_ || _)
   io.out.bits.debugInfo := 0.U.asTypeOf(io.out.bits.debugInfo)
 }