Provide sensible toString for getter/setter in reflection.

compiler/testData/codegen/box/reflection/methodsFromAny/propertyToString.kt

@@ -29,5 +29,11 @@ fun box(): String {
     assertToString("var kotlin.ranges.IntRange?.ext2: kotlin.Int", IntRange::ext2)
     assertToString("val test.A.mem: kotlin.String", A::mem)
     assertToString("var test.B.mem: kotlin.String", B::mem)
+    assertToString("getter of val top: kotlin.Int", ::top.getter)
+    assertToString("getter of var top2: kotlin.Int", ::top2.getter)
+    assertToString("setter of var top2: kotlin.Int", ::top2.setter)
+    assertToString("getter of val test.A.mem: kotlin.String", A::mem.getter)
+    assertToString("getter of var test.B.mem: kotlin.String", B::mem.getter)
+    assertToString("setter of var test.B.mem: kotlin.String", B::mem.setter)
     return "OK"
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -155,6 +155,8 @@ internal abstract class KPropertyImpl<out V> private constructor(
         override val caller: Caller<*> by ReflectProperties.lazy {
             computeCallerForAccessor(isGetter = true)
         }
+
+        override fun toString(): String = "getter of $property"
     }
 
     abstract class Setter<V> : Accessor<V, Unit>(), KMutableProperty.Setter<V> {
@@ -168,6 +170,8 @@ internal abstract class KPropertyImpl<out V> private constructor(
         override val caller: Caller<*> by ReflectProperties.lazy {
             computeCallerForAccessor(isGetter = false)
         }
+
+        override fun toString(): String = "setter of $property"
     }
 
     companion object {