Remove explicit AppScheduledExecutorService shutdown (commit revert)

Revert "Problem: manually shutdown AppScheduledExecutorService to allow compiler stop properly"

The commit was added during update to 162.1024.1 to fix hangs in ant
tasks on teamcity because of some thread created in
AppScheduledExecutorService service.

Remove the commit because can't reproduce those hangs under 162.2946
(Probably https://github.com/JetBrains/intellij-community/commit/12a079ef41882343bf83ef2a7dcee820b55fd154 fixed the hangs).

This should also be addressed in fix for https://youtrack.jetbrains.com/issue/IDEA-169562

This reverts commit 99a75021e1.

compiler/builtins-serializer/src/org/jetbrains/kotlin/serialization/builtins/run.kt

@@ -16,8 +16,6 @@
 
 package org.jetbrains.kotlin.serialization.builtins
 
-import com.intellij.util.concurrency.AppExecutorUtil
-import com.intellij.util.concurrency.AppScheduledExecutorService
 import java.io.File
 
 fun main(args: Array<String>) {
@@ -43,13 +41,7 @@ found top-level declarations to <destination dir> (*.kotlin_builtins files)"""
     val missing = srcDirs.filterNot(File::exists)
     assert(missing.isEmpty()) { "These source directories are missing: $missing" }
 
-    try {
-        BuiltInsSerializer(dependOnOldBuiltIns = false).serialize(destDir, srcDirs, listOf()) { totalSize, totalFiles ->
-            println("Total bytes written: $totalSize to $totalFiles files")
-        }
-    }
-    finally {
-        val service = AppExecutorUtil.getAppScheduledExecutorService() as AppScheduledExecutorService
-        service.shutdownAppScheduledExecutorService()
+    BuiltInsSerializer(dependOnOldBuiltIns = false).serialize(destDir, srcDirs, listOf()) { totalSize, totalFiles ->
+        println("Total bytes written: $totalSize to $totalFiles files")
     }
 }