Fix most unchecked/deprecation javac warnings in compiler modules

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

@@ -28,13 +28,13 @@ abstract class AbstractNode extends HasMetadata implements JsNode {
         return out.toString();
     }
 
+    @SuppressWarnings("unchecked")
     protected <T extends HasMetadata & JsNode> T withMetadataFrom(T other) {
         this.copyMetadataFrom(other);
         Object otherSource = other.getSource();
         if (otherSource != null) {
             source(otherSource);
         }
-        //noinspection unchecked
         return (T) this;
     }
 }

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

@@ -100,6 +100,7 @@ public class JsFor extends SourceInfoAwareJsNode implements JsLoop {
     }
 
     @Override
+    @SuppressWarnings("unchecked")
     public void traverse(JsVisitorWithContext v, JsContext ctx) {
         if (v.visit(this, ctx)) {
             assert (!(initExpression != null && initVars != null));

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

@@ -48,10 +48,10 @@ public abstract class JsVisitorWithContext {
         doAcceptList(collection);
     }
 
+    @SuppressWarnings("unchecked")
     public final <T extends JsStatement> T acceptStatement(T statement) {
         if (statement == null) return null;
 
-        //noinspection unchecked
         return (T) doAcceptStatement(statement);
     }
 

js/js.ast/src/org/jetbrains/kotlin/js/util/AstUtil.java

@@ -7,9 +7,6 @@ package org.jetbrains.kotlin.js.util;
 import com.intellij.util.SmartList;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.js.backend.ast.JsBinaryOperation;
-import org.jetbrains.kotlin.js.backend.ast.JsBinaryOperator;
-import org.jetbrains.kotlin.js.backend.ast.JsExpression;
 import org.jetbrains.kotlin.js.backend.ast.JsNode;
 
 import java.util.ArrayList;
@@ -20,10 +17,10 @@ public final class AstUtil {
     }
 
     @Nullable
+    @SuppressWarnings("unchecked")
     public static <T extends JsNode> T deepCopy(@Nullable T node) {
         if (node == null) return null;
 
-        //noinspection unchecked
         return (T) node.deepCopy();
     }