Log IRCache stats once at the end of each run

This is much simpler and good enough. It also will not force us to
expose a strange setting in the next commit.

Author: gzm0

sbt-plugin/src/main/scala/org/scalajs/sbtplugin/ScalaJSPlugin.scala

@@ -171,12 +171,6 @@ object ScalaJSPlugin extends AutoPlugin {
 
   import autoImport._
 
-  /** Logs the current statistics about the global IR cache. */
-  def logIRCacheStats(logger: Logger): Unit = {
-    import ScalaJSPluginInternal.globalIRCache
-    logger.debug("Global IR cache stats: " + globalIRCache.stats.logLine)
-  }
-
   override def globalSettings: Seq[Setting[_]] = {
     Seq(
         scalaJSStage := Stage.FastOpt,
@@ -187,12 +181,15 @@ object ScalaJSPlugin extends AutoPlugin {
 
         // Clear the IR cache stats every time a sequence of tasks ends
         onComplete := {
+          import ScalaJSPluginInternal.globalIRCache
+
           val prev = onComplete.value
 
           { () =>
             prev()
             ScalaJSPluginInternal.closeAllTestAdapters()
-            ScalaJSPluginInternal.globalIRCache.clearStats()
+            sLog.value.debug("Global IR cache stats: " + globalIRCache.stats.logLine)
+            globalIRCache.clearStats()
           }
         },
 

sbt-plugin/src/main/scala/org/scalajs/sbtplugin/ScalaJSPluginInternal.scala

@@ -48,7 +48,6 @@ import sjsonnew.BasicJsonProtocol.seqFormat
 private[sbtplugin] object ScalaJSPluginInternal {
 
   import ScalaJSPlugin.autoImport.{ModuleKind => _, _}
-  import ScalaJSPlugin.logIRCacheStats
 
   /** The global Scala.js IR cache */
   val globalIRCache: IRFileCache = StandardImpl.irFileCache()
@@ -216,8 +215,6 @@ private[sbtplugin] object ScalaJSPluginInternal {
                 throw new MessageOnlyException(e.getMessage)
             }
 
-            logIRCacheStats(log)
-
             Set(output, sourceMapFile)
           } (realFiles.toSet)
 
@@ -310,8 +307,6 @@ private[sbtplugin] object ScalaJSPluginInternal {
           new IRTreePrinter(stdout).print(tree)
           stdout.flush()
         }
-
-        logIRCacheStats(streams.value.log)
       },
 
       artifactPath in fastOptJS :=