Make inline+reified functions synthetic instead of private in bytecode

#KT-18563 Fixed

compiler/testData/writeFlags/inline/inlineOnly.kt

@@ -0,0 +1,10 @@
+// IGNORE_BACKEND: JVM_IR
+class MyClass {
+    @Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+    @kotlin.internal.InlineOnly
+    inline fun test(s: String) {}
+}
+
+// TESTED_OBJECT_KIND: function
+// TESTED_OBJECTS: MyClass, test
+// FLAGS: ACC_PRIVATE, ACC_FINAL