Build: add kotlin.build.useIRForLibraries to enable JVM IR for libraries separately

The next step for JVM IR adoption in our project is going to be enabling
`kotlin.build.useIR`, but keeping `kotlin.build.useIRForLibraries`
disabled until we fix all remaining ABI incompatibility issues for
library code.

libraries/commonConfiguration.gradle

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 ext.configureJavaOnlyJvm6Project = { Project project ->
     project.tasks.withType(JavaCompile) {
         sourceCompatibility = 1.6
@@ -193,6 +195,19 @@ ext.configureLegacyPublishing = { Project project ->
     }
 }
 
+ext.configureJvmIrBackend = { Project project ->
+    project.tasks.withType(KotlinCompile.class) { task ->
+        task.kotlinOptions {
+            if (CommonUtilKt.getBooleanProperty(project, "kotlin.build.useIRForLibraries")) {
+                useIR = true
+                freeCompilerArgs += ["-Xir-binary-with-stable-abi"]
+            } else {
+                useIR = false
+            }
+        }
+    }
+}
+
 allprojects { project ->
     project.ext.configureSourcesJar = { lambda = {} ->
         ArtifactsKt.sourcesJar(project) { task ->