Reflection: improve and optimize kotlinFunction/kotlinProperty

- Make the implementations very similar, to fix KT-54833 where the
  companion object case was forgotten for kotlinProperty.
- Optimize both functions to look up the function/property by name
  first, to cover the most probable case when the JVM name of a
  declaration is equal to its Kotlin name. This fixes KT-55937.

 #KT-54833 Fixed
 #KT-55937 Fixed

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

@@ -0,0 +1,16 @@
+// WITH_REFLECT
+// TARGET_BACKEND: JVM
+
+import kotlin.reflect.KProperty1
+import kotlin.reflect.jvm.kotlinProperty
+
+class C {
+    companion object {
+        val x = "OK"
+    }
+}
+
+fun box(): String {
+    val f = C::class.java.getDeclaredField("x").kotlinProperty as KProperty1<C.Companion, String>
+    return f.get(C.Companion)
+}