[Test] Use rethrow for checked exception in java-written tests

In 9b5a9ccb `throws Exception` was removed from java test sources and
  all checked exceptions were wrapped with `RuntimeException`

But it was forgotten that there is a `rethrow` utility, which doesn't
  wrap exception but makes the javac happy at the same time

compiler/tests-common/tests/org/jetbrains/kotlin/codegen/CodegenTestCase.java

@@ -526,7 +526,7 @@ public abstract class CodegenTestCase extends KotlinBaseTest<KotlinBaseTest.Test
         try {
             doMultiFileTest(file, testFiles);
         } catch (Exception e) {
-            throw new RuntimeException(e);
+            throw ExceptionUtilsKt.rethrow(e);
         }
     }
 

compiler/tests-common/tests/org/jetbrains/kotlin/codegen/defaultConstructor/AbstractDefaultArgumentsReflectionTest.java

@@ -20,6 +20,7 @@ import com.intellij.openapi.util.io.FileUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.codegen.CodegenTestCase;
 import org.jetbrains.kotlin.test.ConfigurationKind;
+import org.jetbrains.kotlin.utils.ExceptionUtilsKt;
 
 import java.io.File;
 import java.io.IOException;
@@ -41,7 +42,7 @@ public abstract class AbstractDefaultArgumentsReflectionTest extends CodegenTest
             doTestImpl(path);
         }
         catch (IOException e) {
-            throw new RuntimeException(e);
+            throw ExceptionUtilsKt.rethrow(e);
         }
     }