Revert [JS IR] commits that failed build

Revert "[JS IR] Build hybrid versions of stdlib and kotlin.test"
This reverts commit b9f88350dd.

Revert "[JS IR] Add gradle plugin integration tests"
This reverts commit d872b27663.

Revert "Update bootstrap"
This reverts commit bc47594c7a.

Revert "[JS IR] Support generating both IR and pre-IR libraries"
This reverts commit 1b8df45bfe.

libraries/kotlin.test/js-ir/build.gradle

@@ -0,0 +1,70 @@
+description = 'Kotlin Test for JS IR'
+
+apply plugin: 'kotlin-platform-js'
+
+
+dependencies {
+    expectedBy project(':kotlin-test:kotlin-test-common')
+    expectedBy project(':kotlin-test:kotlin-test-annotations-common')
+    compile project(':kotlin-stdlib-js-ir')
+}
+
+def jsCommonDir = "${buildDir}/common-js-sources"
+
+task prepareCommonJsSources(type: Sync) {
+    from "${projectDir}/../js/src/"
+    into jsCommonDir
+}
+
+compileKotlin2Js {
+    dependsOn prepareCommonJsSources
+
+    kotlinOptions {
+        moduleKind = "umd"
+        freeCompilerArgs = [
+                "-Xir",
+                "-Xir-produce-only=klib",
+                "-Xallow-kotlin-package",
+                "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
+        ]
+    }
+}
+
+sourceSets {
+    main {
+        kotlin {
+            srcDir jsCommonDir
+        }
+    }
+}
+
+compileTestKotlin2Js {
+    kotlinOptions.freeCompilerArgs = [
+        "-Xir",
+        "-Xir-produce-only=js",
+        "-Xallow-kotlin-package",
+    ]
+    kotlinOptions {
+        metaInfo = false
+        moduleKind = "umd"
+    }
+}
+
+task sourcesJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from(sourceSets.main.allSource)
+}
+
+archivesBaseName = 'kotlin-test-js-ir'
+
+jar {
+    manifestAttributes(manifest, project, 'Test')
+}
+
+artifacts {
+    archives sourcesJar
+}
+
+if (project.findProperty("kotlin.stdlib.js.ir.publish")?.toBoolean() == true) {
+    configurePublishing(project)
+}

libraries/kotlin.test/js/build.gradle

@@ -16,11 +16,7 @@ dependencies {
 }
 
 compileKotlin2Js {
-    kotlinOptions.freeCompilerArgs = [
-            "-Xallow-kotlin-package",
-            "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
-            "-Xir-produce-klib-dir"
-    ]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xuse-experimental=kotlin.contracts.ExperimentalContracts"]
     kotlinOptions {
         moduleKind = "umd"
         outputFile = "${buildDir}/classes/main/kotlin-test.js"