feat: add limited support of comments inside js call.

js/js.ast/src/org/jetbrains/kotlin/js/backend/JsToStringGenerationVisitor.java

@@ -1138,6 +1138,15 @@ public class JsToStringGenerationVisitor extends JsVisitor {
         newline();
     }
 
+    @Override
+    public void visitMultiLineComment(@NotNull JsMultiLineComment comment) {
+        p.print("/*");
+        p.print(comment.getText());
+        p.print("*/");
+        needSemi = false;
+        newline();
+    }
+
     @Override
     public void visitDocComment(@NotNull JsDocComment comment) {
         boolean asSingleLine = comment.getTags().size() == 1;

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsMultiLineComment.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.js.backend.ast
+
+class JsMultiLineComment(val text: String) : SourceInfoAwareJsNode(), JsStatement {
+    override fun accept(visitor: JsVisitor) {
+        visitor.visitMultiLineComment(this)
+    }
+
+    override fun acceptChildren(visitor: JsVisitor) {
+    }
+
+    override fun traverse(visitor: JsVisitorWithContext, ctx: JsContext<*>) {
+        visitor.visit(this, ctx)
+        visitor.endVisit(this, ctx)
+    }
+
+    override fun deepCopy() = this
+}

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsVisitor.kt

@@ -165,6 +165,9 @@ abstract class JsVisitor {
     open fun visitSingleLineComment(comment: JsSingleLineComment): Unit =
             visitElement(comment)
 
+    open fun visitMultiLineComment(comment: JsMultiLineComment): Unit =
+            visitElement(comment)
+
     open fun visitExport(export: JsExport): Unit =
             visitElement(export)
 

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsVisitorWithContext.java

@@ -214,6 +214,9 @@ public abstract class JsVisitorWithContext {
     public void endVisit(@NotNull JsSingleLineComment x, @NotNull JsContext ctx) {
     }
 
+    public void endVisit(@NotNull JsMultiLineComment x, @NotNull JsContext ctx) {
+    }
+
     public void endVisit(@NotNull JsExport x, @NotNull JsContext ctx) {
     }
 
@@ -404,6 +407,10 @@ public abstract class JsVisitorWithContext {
         return true;
     }
 
+    public boolean visit(@NotNull JsMultiLineComment x, @NotNull JsContext ctx) {
+        return true;
+    }
+
     public boolean visit(@NotNull JsExport x, @NotNull JsContext ctx) {
         return true;
     }