IR: additional callable reference adapter stuff in IR

- IrFunctionReference.reflectionTarget: IrFunctionSymbol?
- add separate declaration origin for callable reference adapters
- bump IR ABI version

compiler/util-klib/src/org/jetbrains/kotlin/library/KotlinAbiVersion.kt

@@ -22,7 +22,7 @@ fun String.parseKonanAbiVersion(): KotlinAbiVersion {
 
 data class KotlinAbiVersion(val version: Int) {
     companion object {
-        val CURRENT = KotlinAbiVersion(24)
+        val CURRENT = KotlinAbiVersion(25)
     }
 
     override fun toString() = "$version"