Remove experimental coroutines usages from stdlib generator

libraries/tools/kotlin-stdlib-gen/src/templates/dsl/TemplateGroups.kt

@@ -5,7 +5,6 @@
 
 package templates
 
-import kotlin.coroutines.experimental.buildSequence
 import kotlin.reflect.KTypeProjection
 import kotlin.reflect.full.createType
 import kotlin.reflect.full.isSubtypeOf
@@ -17,7 +16,7 @@ fun templateGroupOf(vararg templates: MemberTemplate): TemplateGroup = { templat
 
 abstract class TemplateGroupBase : TemplateGroup {
 
-    override fun invoke(): Sequence<MemberTemplate> = buildSequence {
+    override fun invoke(): Sequence<MemberTemplate> = sequence {
         with(this@TemplateGroupBase) {
             this::class.members.filter { it.name.startsWith("f_") }.forEach {
                 require(it.parameters.size == 1) { "Member $it violates naming convention" }

libraries/tools/kotlin-stdlib-gen/src/templates/dsl/Templates.kt

@@ -5,8 +5,6 @@
 
 package templates
 
-import kotlin.coroutines.experimental.*
-
 @DslMarker
 annotation class TemplateDsl
 
@@ -184,7 +182,7 @@ class FamilyPrimitiveMemberDefinition : MemberTemplateDefinition<PrimitiveType?>
         }
     }
 
-    override fun parametrize(): Sequence<Pair<Family, PrimitiveType?>> = buildSequence {
+    override fun parametrize(): Sequence<Pair<Family, PrimitiveType?>> = sequence {
         for ((family, primitives) in familyPrimitives) {
             if (primitives.isEmpty())
                 yield(family to null)