Removing usages of tuples from test data

(KT-2358 Drop tuples)
 #KT-2358 In progress

compiler/testData/codegen/regressions/kt1538.kt

@@ -2,17 +2,17 @@ import java.util.HashMap
 
 fun parseCatalogs(hashMap: Any?) {
     val r = toHasMap(hashMap)
-    if (!r._1) {
+    if (!r.first) {
         return
     }
-    val nodes = r._2
+    val nodes = r.second
 }
 
-fun toHasMap(value: Any?): #(Boolean, HashMap<String, Any?>?) {
+fun toHasMap(value: Any?): Pair<Boolean, HashMap<String, Any?>?> {
     if(value is HashMap<*, *>) {
-        return #(true, value as HashMap<String, Any?>)
+        return Pair(true, value as HashMap<String, Any?>)
     }
-    return #(false, null as HashMap<String, Any?>?)
+    return Pair(false, null as HashMap<String, Any?>?)
 }
 
 fun box() : String {

compiler/testData/codegen/regressions/kt2062.kt

@@ -1,5 +1,5 @@
 fun box(): String {
   val a = if(true) {
   }
-  return if (a.toString() == "()") "OK" else "fail"
+  return if (a.toString() == "Unit.VALUE") "OK" else "fail"
 }

compiler/testData/codegen/regressions/kt237.jet

@@ -1,9 +1,9 @@
 fun main(args: Array<String>?) {
-    val y: Unit = #() //do not compile
+    val y: Unit = Unit.VALUE //do not compile
     A<Unit>()        //do not compile
-    C<Unit>(#())      //do not compile
+    C<Unit>(Unit.VALUE)      //do not compile
         //do not compile
-    System.out?.println(fff<Unit>(#()))  //do not compile
+    System.out?.println(fff<Unit>(Unit.VALUE))  //do not compile
     System.out?.println(id<Unit>(y))  //do not compile
     System.out?.println(fff<Unit>(id<Unit>(y)) == id<Unit>(foreach(Array<Int>(0,{0}),{(e : Int) : Unit -> })))  //do not compile
 }

compiler/testData/codegen/regressions/kt344.jet

@@ -27,7 +27,7 @@ fun t1() : Boolean {
         x = x + "45" + y
         x = x.substring(3)
         x += "aaa"
-        #()
+        Unit.VALUE
     }
     foo()
 
@@ -43,7 +43,7 @@ fun t2() : Boolean {
         x = x + 5 + y
         x += 5
         x++
-        #()
+        Unit.VALUE
     }
     foo()
     x -= 55
@@ -55,7 +55,7 @@ fun t3() : Boolean {
     var x = true
     val foo = {
         x = false
-        #()
+        Unit.VALUE
     }
     foo()
     return !x
@@ -67,7 +67,7 @@ fun t4() : Boolean {
     val foo = {
         x = x + 200.toFloat() + y
         x += 18
-        #()
+        Unit.VALUE
     }
     foo()
     System.out?.println(x)
@@ -80,7 +80,7 @@ fun t5() : Boolean {
     val foo = {
         x = x + 200.toDouble() + y
         x -= 22
-        #()
+        Unit.VALUE
     }
     foo()
     System.out?.println(x)
@@ -94,7 +94,7 @@ fun t6() : Boolean {
         x = (x + 20.toByte() + y).toByte()
         x += 2
         x--
-        #()
+        Unit.VALUE
     }
     foo()
     System.out?.println(x)
@@ -105,7 +105,7 @@ fun t7() : Boolean {
     var x : Char = 'a'
     val foo = {
         x = 'b'
-        #()
+        Unit.VALUE
     }
     foo()
     System.out?.println(x)
@@ -117,10 +117,10 @@ fun t8() : Boolean {
     val foo = {
         val bar = {
             x = 30.toShort()
-            #()
+            Unit.VALUE
         }
         bar()
-        #()
+        Unit.VALUE
     }
     foo()
     return x == 30.toShort()