feat: remove legacy JS backend

Author: msfjarvis

benchmark/build.gradle.kts

@@ -16,7 +16,6 @@ allOpen { annotation("org.openjdk.jmh.annotations.State") }
 benchmark {
   targets {
     register("js")
-    register("jsIR")
     register("jvm")
     if (providers.gradleProperty("enableNativeTargets").isPresent) {
       register("native")
@@ -26,8 +25,7 @@ benchmark {
 
 kotlin {
   jvm()
-  js { nodejs() }
-  js("jsIR", IR) { nodejs() }
+  js(IR) { nodejs() }
   if (providers.gradleProperty("enableNativeTargets").isPresent) {
     if (HostManager.hostIsLinux) linuxX64("native") { configureTarget() }
     if (HostManager.hostIsMingw) mingwX64("native") { configureTarget() }

build.gradle.kts

@@ -62,7 +62,7 @@ spotless {
 kotlin {
   explicitApi()
   jvm()
-  js(BOTH) {
+  js(IR) {
     nodejs {}
     browser {}
     compilations.all {

sample/build.gradle.kts

@@ -11,7 +11,7 @@ fun KotlinNativeTargetWithHostTests.configureTarget() = binaries {
 }
 
 kotlin {
-  js(LEGACY) {
+  js(IR) {
     browser()
     nodejs()
     binaries.executable()