JS: don't remove debugger statement from coroutine

See KT-19826

js/js.inliner/src/org/jetbrains/kotlin/js/coroutine/CoroutineBodyTransformer.kt

@@ -338,6 +338,10 @@ class CoroutineBodyTransformer(private val context: CoroutineTransformationConte
         currentStatements += x
     }
 
+    override fun visitDebugger(x: JsDebugger) {
+        currentStatements += x
+    }
+
     private fun handleExpression(expression: JsExpression): JsExpression? {
         val assignment = JsAstUtils.decomposeAssignment(expression)
         if (assignment != null) {

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -944,6 +944,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("js/js.translator/testData/box/coroutines"), Pattern.compile("^([^_](.+))\\.kt$"), TargetBackend.JS, true);
         }
 
+        @TestMetadata("debugStatement.kt")
+        public void testDebugStatement() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/coroutines/debugStatement.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("localVarOptimization.kt")
         public void testLocalVarOptimization() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/coroutines/localVarOptimization.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/utils/DirectiveTestUtils.java

@@ -205,6 +205,8 @@ public class DirectiveTestUtils {
 
     private static final DirectiveHandler COUNT_NULLS = new CountNodesDirective<>("CHECK_NULLS_COUNT", JsNullLiteral.class);
 
+    private static final DirectiveHandler COUNT_DEBUGGER = new CountNodesDirective<>("CHECK_DEBUGGER_COUNT", JsDebugger.class);
+
     private static final DirectiveHandler NOT_REFERENCED = new DirectiveHandler("CHECK_NOT_REFERENCED") {
         @Override
         void processEntry(@NotNull JsNode ast, @NotNull ArgumentsHelper arguments) throws Exception {
@@ -337,6 +339,7 @@ public class DirectiveTestUtils {
             COUNT_VARS,
             COUNT_BREAKS,
             COUNT_NULLS,
+            COUNT_DEBUGGER,
             NOT_REFERENCED,
             HAS_INLINE_METADATA,
             HAS_NO_INLINE_METADATA,

js/js.translator/testData/box/coroutines/debugStatement.kt

@@ -0,0 +1,14 @@
+// EXPECTED_REACHABLE_NODES: 1152
+// CHECK_DEBUGGER_COUNT: function=doResume count=1
+
+fun foo(f: suspend () -> Unit) {
+}
+
+fun box(): String {
+    foo {
+        println("aaa")
+        js("debugger;")
+        println("bbb")
+    }
+    return "OK"
+}