Return back to using Exec task instead of JavaExec for serializing builtins

Idea patches all JavaExec tasks and enables debugger for them. This
causes unexpected breakpoints stops during serialization (IDEA-200192).

An attempt with explicit removing added agentlib:jdwp= parameter breaks
Gradle up-to-date check for this task:

> Task ':core:builtins:serialize' is not up-to-date because:
>   Value of input property 'jvmArgs' has changed for task ':core:builtins:serialize'

Co-authored-by: Ilya Gorbunov <ilya.gorbunov@jetbrains.com>

core/builtins/build.gradle.kts

@@ -18,21 +18,23 @@ val clean by tasks.getting {
     }
 }
 
-val serialize by tasks.creating(JavaExec::class) {
+val JDK_18: String = rootProject.extra["JDK_18"] as String
+
+// We avoid using JavaExec task here due to IDEA-200192:
+// IDEA attaches debugger to all JavaExec tasks making our breakpoints trigger during irrelevant task execution
+val serialize by tasks.creating(Exec::class) {
     val outDir = builtinsSerialized
     val inDirs = arrayOf(builtinsSrc, builtinsNative)
     inDirs.forEach { inputs.dir(it) }
     outputs.dir(outDir)
 
-    classpath(rootProject.buildscript.configurations["bootstrapCompilerClasspath"])
+    commandLine(
-    main = "org.jetbrains.kotlin.serialization.builtins.RunKt"
+        "$JDK_18/bin/java",
-
+        "-Didea.io.use.nio2=true",
-    doFirst {
+        "-cp", rootProject.buildscript.configurations["bootstrapCompilerClasspath"].asPath,
-        // Reassign to remove debugger options. Workaround for IDEA-200192.
+        "org.jetbrains.kotlin.serialization.builtins.RunKt",
-        jvmArgs = listOf("-Didea.io.use.nio2=true")
+        outDir, *inDirs
-    }
+    )
-
-    args(outDir, *inDirs)
 }
 
 val builtinsJar by task<Jar> {