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/nonTrivialFunctionNames.kt

@@ -0,0 +1,39 @@
+// WITH_REFLECT
+// TARGET_BACKEND: JVM
+
+import kotlin.reflect.KFunction
+import kotlin.reflect.jvm.javaMethod
+import kotlin.reflect.jvm.kotlinFunction
+import kotlin.test.assertEquals
+
+class A {
+    @JvmName("jvmFoo")
+    fun foo(s: String): Int = s.length
+
+    fun mangled(z: Z): Number = z.value
+
+    internal fun internal(s: String): Int = s.length
+
+
+    // Some different members with similar JVM signatures, to check that kotlinFunction doesn't incorrectly resolve into one of these.
+    private fun jvmFoo(s: String): String = s
+    private fun `mangled-IQRRRT4`(z: Number) {}
+    private fun `internal$main`(s: String): String = s
+}
+
+@JvmInline
+value class Z(val value: Number)
+
+fun test(f: KFunction<*>) {
+    val javaMethod = f.javaMethod
+        ?: error("javaMethod == null for $f")
+    assertEquals(f, javaMethod.kotlinFunction, "Incorrect kotlinFunction for $javaMethod")
+}
+
+fun box(): String {
+    test(A::foo)
+    test(A::mangled)
+    test(A::internal)
+
+    return "OK"
+}