Minor: revert changes in StackValue and fix tes data.

(this commit should be reverted after make Unit object)

compiler/testData/cfg/controlStructures/Finally.values

@@ -268,8 +268,8 @@ fun t11() {
   }
 }
 ---------------------
-1   <v0>: *      NEW: r(1) -> <v0>
-2   <v1>: Unit   NEW: r(2) -> <v1>
+1   <v0>: *           NEW: r(1) -> <v0>
+2   <v1>: {<: Unit}   NEW: r(2) -> <v1>
 =====================
 == t12 ==
 fun t12() : Int {

compiler/testData/cfg/tailCalls/try.values

@@ -8,5 +8,5 @@ tailRecursive fun foo() {
 }
 ---------------------
         <v1>: {<: Throwable}   NEW: magic[FAKE_INITIALIZER](e: Throwable) -> <v1>
-foo()   <v0>: Unit             NEW: call(foo(), foo) -> <v0>                     
+foo()   <v0>: {<: Unit}        NEW: call(foo(), foo) -> <v0>
 =====================