Fixed the parameter passing to exec LogUtils.

Fixed the unexpected output.
But I could not fully explain the scala or chisel issues behind this.
It just worked.

src/main/scala/xiangshan/utils/LogUtils.scala

@@ -70,7 +70,7 @@ sealed abstract class LogHelper(val logLevel: XSLogLevel) extends HasXSParameter
   }
 
   // dump under with certain prefix
-  def exec(dump: => Unit)(implicit name: String): Unit = {
+  def exec(dump: () => Unit)(implicit name: String): Unit = {
     when (trigger) {
       printPrefix
       dump
@@ -78,7 +78,7 @@ sealed abstract class LogHelper(val logLevel: XSLogLevel) extends HasXSParameter
   }
 
   // dump under certain condition and with certain prefix
-  def exec(cond: Bool, dump: => Unit)(implicit name: String): Unit = {
+  def exec(cond: Bool, dump: () => Unit)(implicit name: String): Unit = {
     when (trigger && cond) {
       printPrefix
       dump