Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/callableReference/function/overloadedFun.kt

@@ -0,0 +1,27 @@
+fun foo(): String = "foo1"
+fun foo(i: Int): String = "foo2"
+
+val f1: () -> String = ::foo
+val f2: (Int) -> String = ::foo
+
+fun foo1() {}
+fun foo2(i: Int) {}
+
+fun bar(f: () -> Unit): String = "bar1"
+fun bar(f: (Int) -> Unit): String = "bar2"
+
+fun box(): String {
+    val x1 = f1()
+    if (x1 != "foo1") return "Fail 1: $x1"
+    
+    val x2 = f2(0)
+    if (x2 != "foo2") return "Fail 2: $x2"
+    
+    val y1 = bar(::foo1)
+    if (y1 != "bar1") return "Fail 3: $y1"
+    
+    val y2 = bar(::foo2)
+    if (y2 != "bar2") return "Fail 4: $y2"
+    
+    return "OK"
+}

compiler/testData/codegen/box/callableReference/function/overloadedFunVsVal.kt

@@ -1,5 +1,4 @@
 import kotlin.reflect.*
-import kotlin.test.assertEquals
 
 class A {
     val x = 1
@@ -12,8 +11,8 @@ val f2: (A) -> String = A::x
 fun box(): String {
     val a = A()
 
-    assertEquals(1, f1.get(a))
-    assertEquals("OK", f2(a))
+    val x1 = f1.get(a)
+    if (x1 != 1) return "Fail 1: $x1"
 
-    return "OK"
-}
+    return f2(a)
+}