Build: Make DexMethodCount task cacheable, extract print stats to task

libraries/reflect/build.gradle.kts

@@ -217,12 +217,11 @@ val modularJar by task<Jar> {
     callGroovy("manifestAttributes", manifest, project, "Main", true)
 }
 
-val dexMethodCount by task<DexMethodCount> {
+dexMethodCount {
     dependsOn(result)
     jarFile = result.get().outputs.files.single()
     ownPackages = listOf("kotlin.reflect")
 }
-tasks.getByName("check").dependsOn(dexMethodCount)
 
 artifacts {
     listOf(mainJar.name, "runtime", "archives").forEach { configurationName ->

libraries/stdlib/jvm/build.gradle

@@ -106,11 +106,10 @@ artifacts {
 
 javadocJar()
 
-task dexMethodCount(type: DexMethodCount) {
-    from jar
-    ownPackages = ['kotlin']
+DexMethodCountKt.dexMethodCount(project) { task ->
+    task.from(jar)
+    task.ownPackages = ['kotlin']
 }
-check.dependsOn(dexMethodCount)
 
 compileKotlin {
     kotlinOptions {