Refactor codegen tests

- initialize environment only once in setUp()
- add comments on why some tests are disabled
- modify and rename some tests
- re-enable now working tests
- extract some tests into files with box()
- remove useless 'throws' declarations and commented code

compiler/testData/codegen/controlStructures/forLoopMemberExtensionAll.kt

@@ -12,12 +12,14 @@ class X {
 
     fun test() {
         for (i in C()) {
-            System.out.println(i)
+            foo(i)
         }
     }
 
 }
 
+fun foo(x: Int) {}
+
 fun main(args: Array<String>) {
     X().test()
-}
+}

compiler/testData/codegen/controlStructures/forLoopMemberExtensionHasNext.kt

@@ -12,12 +12,14 @@ class X {
 
     fun test() {
         for (i in C()) {
-            System.out.println(i)
+            foo(i)
         }
     }
 
 }
 
+fun foo(x: Int) {}
+
 fun main(args: Array<String>) {
     X().test()
-}
+}

compiler/testData/codegen/controlStructures/forLoopMemberExtensionNext.kt

@@ -12,12 +12,14 @@ class X {
 
     fun test() {
         for (i in C()) {
-            System.out.println(i)
+            foo(i)
         }
     }
 
 }
 
+fun foo(x: Int) {}
+
 fun main(args: Array<String>) {
     X().test()
-}
+}

compiler/testData/codegen/controlStructures/forNullableIntArray.kt

@@ -9,7 +9,6 @@ fun box() : String {
     for (el in b) {
         sum = sum + (el ?: 0)
     }
-    System.out?.println(sum)
     if(sum != 10) return "b failed"
 
     return "OK"

compiler/testData/codegen/controlStructures/ifInWhile.kt

@@ -4,7 +4,6 @@ fun box() : String {
     val processors = Runtime.getRuntime()!!.availableProcessors()
     var threadNum = 1
     while(threadNum <= 1024) {
-        System.out?.println(threadNum)
         if(threadNum < 2 * processors)
             threadNum += 1
         else

compiler/testData/codegen/controlStructures/quicksort.kt

@@ -34,9 +34,8 @@ fun box() : String {
         a[2*i+1] = -2*i-1
     }
     a.quicksort()
-    for(i in 0..9) {
-        System.out?.print(a[i])
-        System.out?.print(' ')
+    for(i in 0..a.size-2) {
+        if (a[i] > a[i+1]) return "Fail $i: ${a[i]} > ${a[i+1]}"
     }
     return "OK"
-}
+}