[Test] Don't generate throws Exception on methods of generated tests

This is needed to reduce the size of generated test files, which started
 to exceed default IDE limit
Also update some (mostly old) test utilities to remove exceptions from
 java signatures

compiler/tests/org/jetbrains/kotlin/modules/xml/AbstractModuleXmlParserTest.java

@@ -35,7 +35,7 @@ import java.io.IOException;
 public abstract class AbstractModuleXmlParserTest extends TestCase {
 
     @SuppressWarnings("MethodMayBeStatic")
-    protected void doTest(String xmlPath) throws IOException {
+    protected void doTest(String xmlPath) {
         File txtFile = new File(FileUtil.getNameWithoutExtension(xmlPath) + ".txt");
 
         ModuleChunk result = ModuleXmlParser.parseModuleScript(xmlPath, new MessageCollector() {
@@ -65,7 +65,12 @@ public abstract class AbstractModuleXmlParserTest extends TestCase {
         String actual = sb.toString();
 
         if (!txtFile.exists()) {
-            FileUtil.writeToFile(txtFile, actual);
+            try {
+                FileUtil.writeToFile(txtFile, actual);
+            }
+            catch (IOException e) {
+                throw new RuntimeException(e);
+            }
             fail("Expected data file does not exist. A new file created: " + txtFile);
         }