Minor, restructure reflection tests a little

To allow their usage in https://github.com/udalov/kotlin-obfuscation-test-app

compiler/testData/codegen/box/reflection/mapping/extensionProperty.kt

@@ -14,14 +14,16 @@ var K.ext: Double
         this.value = value.toLong()
     }
 
+val fileFacadeClass = object {}::class.java.enclosingClass
+
 fun box(): String {
     val p = K::ext
 
     val getter = p.javaGetter!!
     val setter = p.javaSetter!!
 
-    assertEquals(getter, Class.forName("ExtensionPropertyKt").getMethod("getExt", K::class.java))
-    assertEquals(setter, Class.forName("ExtensionPropertyKt").getMethod("setExt", K::class.java, Double::class.java))
+    assertEquals(getter, fileFacadeClass.getMethod("getExt", K::class.java))
+    assertEquals(setter, fileFacadeClass.getMethod("setExt", K::class.java, Double::class.java))
 
     val k = K(42L)
     assert(getter.invoke(null, k) == 42.0) { "Fail k getter" }

compiler/testData/codegen/box/reflection/mapping/topLevelProperty.kt

@@ -8,19 +8,20 @@ import kotlin.test.assertEquals
 
 var topLevel = "123"
 
+val fileFacadeClass = object {}::class.java.enclosingClass
+
 fun box(): String {
     val p = ::topLevel
 
     assert(p.javaField != null) { "Fail p field" }
     val field = p.javaField!!
-    val className = field.getDeclaringClass().getName()
-    assertEquals("TopLevelPropertyKt", className)
+    assertEquals(fileFacadeClass, field.getDeclaringClass())
 
     val getter = p.javaGetter!!
     val setter = p.javaSetter!!
 
-    assertEquals(getter, Class.forName("TopLevelPropertyKt").getMethod("getTopLevel"))
-    assertEquals(setter, Class.forName("TopLevelPropertyKt").getMethod("setTopLevel", String::class.java))
+    assertEquals(getter, fileFacadeClass.getMethod("getTopLevel"))
+    assertEquals(setter, fileFacadeClass.getMethod("setTopLevel", String::class.java))
 
     assert(getter.invoke(null) == "123") { "Fail k getter" }
     setter.invoke(null, "456")

compiler/testData/codegen/box/reflection/mapping/types/typeParameters.kt

@@ -18,7 +18,7 @@ fun box(): String {
     if (t !is TypeVariable<*>) return "Fail, t should be a type variable: $t"
 
     assertEquals("T", t.name)
-    assertEquals("A", (t.genericDeclaration as Class<*>).name)
+    assertEquals(A::class.java, (t.genericDeclaration as Class<*>))
 
     return "OK"
 }