Remove +ReleaseCoroutines explicit feature enabling

It's enabled by default in Kotlin 1.3

libraries/stdlib/common/build.gradle

@@ -57,7 +57,6 @@ compileKotlinCommon {
                 "-Xuse-experimental=kotlin.ExperimentalMultiplatform",
                 "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
                 "-XXLanguage:+InlineClasses",
-                "-XXLanguage:+ReleaseCoroutines",
                 "-Xallow-kotlin-package",
                 "-Xallow-result-return-type"
         ]

libraries/stdlib/jdk7/build.gradle

@@ -81,7 +81,7 @@ compileKotlin {
 }
 
 compileTestKotlin {
-    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-XXLanguage:+ReleaseCoroutines", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
 }
 
 compileJava9Sources(project, 'kotlin.stdlib.jdk7')

libraries/stdlib/jdk8/build.gradle

@@ -84,7 +84,7 @@ compileKotlin {
 }
 
 compileTestKotlin {
-    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-XXLanguage:+ReleaseCoroutines", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
 }
 
 compileJava9Sources(project, 'kotlin.stdlib.jdk8')

libraries/stdlib/jre7/build.gradle

@@ -68,7 +68,7 @@ compileKotlin {
 }
 
 compileTestKotlin {
-    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-XXLanguage:+ReleaseCoroutines", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xmulti-platform", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
 }
 
 test {

libraries/stdlib/jre8/build.gradle

@@ -71,7 +71,7 @@ compileKotlin {
 }
 
 compileTestKotlin {
-    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xnormalize-constructor-calls=enable", "-Xmulti-platform", "-XXLanguage:+ReleaseCoroutines", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-Xnormalize-constructor-calls=enable", "-Xmulti-platform", "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"]
 }
 
 test {

libraries/stdlib/js/build.gradle

@@ -155,8 +155,7 @@ compileKotlin2Js {
             "-Xuse-experimental=kotlin.Experimental",
             "-Xuse-experimental=kotlin.ExperimentalMultiplatform",
             "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
-            "-XXLanguage:+InlineClasses",
-            "-XXLanguage:+ReleaseCoroutines"
+            "-XXLanguage:+InlineClasses"
         ]
     }
 }
@@ -193,7 +192,6 @@ compileTestKotlin2Js {
     kotlinOptions {
         moduleKind = "umd"
         freeCompilerArgs += [
-            "-XXLanguage:+ReleaseCoroutines",
             "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"
         ]
     }

libraries/stdlib/jvm/build.gradle

@@ -179,7 +179,6 @@ compileKotlin {
                 "-Xuse-experimental=kotlin.Experimental",
                 "-Xuse-experimental=kotlin.ExperimentalMultiplatform",
                 "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
-                "-XXLanguage:+ReleaseCoroutines",
                 "-XXLanguage:+InlineClasses"
         ]
     }
@@ -254,8 +253,7 @@ compileUnsignedKotlin {
 compileTestKotlin {
     kotlinOptions {
         freeCompilerArgs += [
-                "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes",
-                "-XXLanguage:+ReleaseCoroutines"
+                "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes"
         ]
     }
 }

libraries/stdlib/samples/build.gradle

@@ -11,7 +11,6 @@ sourceSets {
 
 compileTestKotlin {
     kotlinOptions.jdkHome = JDK_18
-    kotlinOptions.freeCompilerArgs += ["-XXLanguage:+ReleaseCoroutines"]
 }
 
 test {