[svsim] Make preprocessor -> cli string public

Make the member function `toCommandLineArgument` of
`VerilogPreprocessorDefine` public so that this can be used by internal
libraries which are rolling their own backends.  This avoids me having to
duplicate this logic internally, unnecessarily.

This method can be made private again once the internal library is
replaced with ChiselSim.

Signed-off-by: Schuyler Eldridge <[email protected]>

Author: seldridge

svsim/src/main/scala/Backend.scala

@@ -22,7 +22,7 @@ object CommonCompilationSettings {
     def apply(name: String) = new VerilogPreprocessorDefine(name, None)
   }
   case class VerilogPreprocessorDefine private (name: String, value: Option[String]) {
-    private[svsim] def toCommandlineArgument(backend: Backend): String = {
+    final def toCommandlineArgument(backend: Backend): String = {
       value match {
         case Some(v) => s"+define+${backend.escapeDefine(name)}=${backend.escapeDefine(v)}"
         case None    => s"+define+${backend.escapeDefine(name)}"