Fix some warnings in JS-specific stdlib sources

libraries/stdlib/src/kotlin/comparisons/Comparisons.kt

@@ -303,13 +303,13 @@ private class ReversedComparator<T>(public val comparator: Comparator<T>): Compa
 }
 
 private object NaturalOrderComparator : Comparator<Comparable<Any>> {
-    override fun compare(c1: Comparable<Any>, c2: Comparable<Any>): Int = c1.compareTo(c2)
+    override fun compare(a: Comparable<Any>, b: Comparable<Any>): Int = a.compareTo(b)
     @Suppress("VIRTUAL_MEMBER_HIDDEN")
     fun reversed(): Comparator<Comparable<Any>> = ReverseOrderComparator
 }
 
 private object ReverseOrderComparator: Comparator<Comparable<Any>> {
-    override fun compare(c1: Comparable<Any>, c2: Comparable<Any>): Int = c2.compareTo(c1)
+    override fun compare(a: Comparable<Any>, b: Comparable<Any>): Int = b.compareTo(a)
     @Suppress("VIRTUAL_MEMBER_HIDDEN")
     fun reversed(): Comparator<Comparable<Any>> = NaturalOrderComparator
 }

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

@@ -171,7 +171,7 @@ fun specialJS(): List<GenericFunction> {
         annotations("@native")
         returns("Unit")
         doc { "Sorts the array in-place according to the order specified by the given [comparison] function." }
-        body { "return noImpl" }
+        body { "noImpl" }
     }
 
     templates add f("sortWith(comparator: Comparator<in T>)") {
@@ -194,7 +194,7 @@ fun specialJS(): List<GenericFunction> {
         returns("Unit")
         doc { "Sorts the array in-place." }
         annotations("""@library("primitiveArraySort")""")
-        body { "return noImpl" }
+        body { "noImpl" }
     }
 
     templates add f("sort()") {