JVM_IR: slightly refactor JvmPropertiesLowering

to make it easier to generate different kinds of synthetic methods.

 #KT-47609 Fixed

compiler/testData/codegen/box/inlineClasses/kt47609.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+// TARGET_BACKEND: JVM
+annotation class Ann(val value: String)
+
+inline class C<T>(val x: String)
+
+@Ann("OK")
+val <T> C<T>.value: String
+    get() = x
+
+fun box() = (C<Any?>::value.annotations.singleOrNull() as? Ann)?.value ?: "null"