Support main entry-point without arguments in JVM

#KT-26574 In Progress

compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.kt

@@ -0,0 +1,9 @@
+package Hello
+
+fun main(args: Array<String>) {
+    System.out.println("Hello!")
+}
+
+fun main() {
+    System.out.println("Fail")
+}

compiler/testData/integration/smoke/helloAppOldAndParameterlessMain/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+Hello!
+
+Return code: 0