Refactor CodegenTestCase

- prohibit main(Array<String>) in favor of box(): String
- move all script-related code to ScriptGenTest
- remove unused environment-creating methods
- inline trivial methods & other minor stuff

compiler/testData/codegen/controlStructures/forLoopMemberExtensionAll.kt

@@ -20,6 +20,7 @@ class X {
 
 fun foo(x: Int) {}
 
-fun main(args: Array<String>) {
+fun box(): String {
     X().test()
+    return "OK"
 }

compiler/testData/codegen/controlStructures/forLoopMemberExtensionHasNext.kt

@@ -20,6 +20,7 @@ class X {
 
 fun foo(x: Int) {}
 
-fun main(args: Array<String>) {
+fun box(): String {
     X().test()
+    return "OK"
 }

compiler/testData/codegen/controlStructures/forLoopMemberExtensionNext.kt

@@ -20,6 +20,7 @@ class X {
 
 fun foo(x: Int) {}
 
-fun main(args: Array<String>) {
+fun box(): String {
     X().test()
+    return "OK"
 }

compiler/testData/codegen/regressions/ea35963.kt

@@ -1,5 +1,6 @@
-fun main(args : Array<String>) {
+fun box(): String {
     if (1 != 0) {
         1
     }
-}
+    return "OK"
+}

compiler/testData/codegen/regressions/kt1535.kt

@@ -9,10 +9,12 @@ class Broken() : jet.Function0<String>() {
     }
 }
 
-fun main(args: Array<String>) {
+fun box(): String {
   val works1: ()->Object = Works();
   works1()
 
   val broken1: ()->String = Broken();
   broken1()
-}
+
+  return "OK"
+}

compiler/testData/codegen/regressions/kt1845_1.kt

@@ -1,5 +1,6 @@
 public var v1: String = "V1"
 
-fun main(args: Array<String>) {
-    System.out?.println("v1: $v1, v2: $v2")
-}
+fun box(): String {
+    val s = "v1: $v1, v2: $v2"
+    return "OK"
+}

compiler/testData/codegen/regressions/kt2210.kt

@@ -2,6 +2,7 @@ class A<T>(t: Array<Array<T>>) {
     val a:Array<Array<T>> = t
 }
 
-fun main(args : Array<String>) {
+fun box(): String {
     A<Int>(array()) // <- java.lang.VerifyError: (class: A, method: getA signature: ()[[Ljava/lang/Object;) Wrong return type in function
-}
+    return "OK"
+}

compiler/testData/codegen/regressions/kt2246.kt

@@ -1,3 +1,4 @@
-fun main(args: Array<String>) {
+fun box(): String {
   kotlin.assert(true)
-}
+  return "OK"
+}

compiler/testData/codegen/regressions/kt2275.kt

@@ -1,6 +1,5 @@
-import java.util.HashMap
-
-fun main(args: Array<String>) {
+fun box(): String {
     (0.toLong() as Number?)?.toByte()
     (0 as Int?)?.toDouble()
-}
+    return "OK"
+}

compiler/testData/codegen/regressions/kt2291.kt

@@ -1,5 +1,6 @@
-fun main(args : Array<String>) {
+fun box(): String {
   1 in 1.rangeTo(10)
   1..10
   'h' in 'A'.rangeTo('Z')
-}
+  return "OK"
+}

compiler/testData/codegen/regressions/kt2416.kt

@@ -1,4 +1,4 @@
-fun main(args: Array<String>) {
+fun box(): String {
     9 in 0..9
     val intRange = 0..9
     9 in intRange
@@ -10,4 +10,6 @@ fun main(args: Array<String>) {
     9.toLong() in longRange
     val shortRange = 0.toShort()..9.toShort()
     9.toShort() in shortRange
-}
+
+    return "OK"
+}

compiler/testData/codegen/regressions/kt2509.kt

@@ -1,5 +1,6 @@
-fun main(args: Array<String>) {
+fun box(): String {
         A()
+        return "OK"
 }
 
 class A: B() {
@@ -8,4 +9,4 @@ class A: B() {
 
 abstract class B {
         abstract var foo: Array<Int?>
-}
+}

compiler/testData/codegen/regressions/kt2711.kt

@@ -7,8 +7,9 @@ class C() {
 }
 
 
-fun main(args: Array<String>) {
+fun box(): String {
     if (2 in C()..2) {
-        System.out?.println(2)
+        2 == 2
     }
-}
+    return "OK"
+}