Support receiving trace filename from VPI for loggers

Useful for testing with different memtraces without having to recompile
design.  This worked before for the trace driver but not for trace
logger.

Usage: make CONFIG=MemtraceCoreConfig run-binary-debug BINARY=none \
       EXTRA_SIM_FLAGS="+memtracefile=nvbit.vecadd.n100000.filter_sm0.lane4.broken.trace"

src/main/scala/tilelink/Coalescing.scala

@@ -1615,11 +1615,11 @@ class MemTraceLogger(
 
     val simReq =
       if (reqEnable)
-        Some(Module(new SimMemTraceLogger(false, s"${filename}.${loggerName}.req", numLanes)))
+        Some(Module(new SimMemTraceLogger(false, s"${filename}", s".${loggerName}.req", numLanes)))
       else None
     val simResp =
       if (respEnable)
-        Some(Module(new SimMemTraceLogger(true, s"${filename}.${loggerName}.resp", numLanes)))
+        Some(Module(new SimMemTraceLogger(true, s"${filename}", s".${loggerName}.resp", numLanes)))
       else None
     if (simReq.isDefined) {
       simReq.get.io.clock := clock
@@ -1787,11 +1787,16 @@ class MemTraceLogger(
 // itself whether it's logging the request stream or the response stream.  This
 // is necessary because we have to generate slightly different trace format
 // depending on this, e.g. response trace will not contain an address column.
-class SimMemTraceLogger(isResponse: Boolean, filename: String, numLanes: Int)
-    extends BlackBox(
+class SimMemTraceLogger(
+    isResponse: Boolean,
+    filenameBase: String,   // usually the same as `filename` of SimMemTrace
+    filenameSuffix: String, // can be ".req", ".resp", .etc
+    numLanes: Int
+) extends BlackBox(
       Map(
         "IS_RESPONSE" -> (if (isResponse) 1 else 0),
-        "FILENAME" -> filename,
+        "FILENAME_BASE" -> filenameBase,
+        "FILENAME_SUFFIX" -> filenameSuffix,
         "NUM_LANES" -> numLanes
       )
     )