StdLib generators: Add some infix extensions for DSL, remove unneeded import, simplify declarations.

js/js.libraries/src/core/kotlin_special.kt

@@ -5,7 +5,6 @@ package kotlin
 // See: https://github.com/JetBrains/kotlin/tree/master/libraries/stdlib
 //
 
-import kotlin.platform.*
 import java.util.*
 
 import java.util.Collections // TODO: it's temporary while we have java.util.Collections in js

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateStandardLib.kt

@@ -37,7 +37,6 @@ fun List<GenericFunction>.writeTo(file: File, builder: GenericFunction.() -> Str
     its.use {
         its.append("package kotlin\n\n")
         its.append("$COMMON_AUTOGENERATED_WARNING\n\n")
-        its.append("import kotlin.platform.*\n") // TODO: Remove unneeded import
         its.append("import java.util.*\n\n")
         its.append("import java.util.Collections // TODO: it's temporary while we have java.util.Collections in js\n\n")
         for (t in this.sortedBy { it.signature }) {

libraries/tools/kotlin-stdlib-gen/src/templates/Engine.kt

@@ -413,20 +413,11 @@ class GenericFunction(val signature: String, val keyword: String = "fun") {
 
 }
 
-fun f(signature: String, init: GenericFunction.() -> Unit): GenericFunction {
-    val gf = GenericFunction(signature)
-    gf.init()
-    return gf
-}
+infix fun MutableList<GenericFunction>.add(item: GenericFunction) = add(item)
+infix fun MutableList<GenericFunction>.addAll(items: Iterable<GenericFunction>) = this.addAll(iterable = items)
 
-fun pval(signature: String, init: GenericFunction.() -> Unit): GenericFunction {
-    val gf = GenericFunction(signature, "val")
-    gf.init()
-    return gf
-}
+fun f(signature: String, init: GenericFunction.() -> Unit) = GenericFunction(signature).apply(init)
 
-fun pvar(signature: String, init: GenericFunction.() -> Unit): GenericFunction {
-    val gf = GenericFunction(signature, "var")
-    gf.init()
-    return gf
-}
+fun pval(signature: String, init: GenericFunction.() -> Unit) = GenericFunction(signature, "val").apply(init)
+
+fun pvar(signature: String, init: GenericFunction.() -> Unit) = GenericFunction(signature, "var").apply(init)