rtti: introduces functionName extension function to FunctionDescriptor for filling vtable with hashcode and reusing it in codegeneration

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/NameUtils.kt

@@ -22,6 +22,9 @@ internal val FunctionDescriptor.symbolName: String
         return "kfun:" + this.fqNameSafe.toString() // FIXME: add signature
     }
 
+internal val FunctionDescriptor.functionName: String
+    get() = this.name.asString() // FIXME: add signature
+
 internal val ClassDescriptor.symbolName: String
     get() = when (this.kind) {
         CLASS -> "kclass:"

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/RTTIGenerator.kt

@@ -202,7 +202,7 @@ internal class RTTIGenerator(override val context: Context) : ContextUtils {
         val vtablePtr = staticData.placeGlobalConstArray("kvtable:$className", pointerType(int8Type), vtable)
 
         val methods = getMethodTableEntries(classDesc).map {
-            val nameSignature = it.name.localHash // FIXME: add signature
+            val nameSignature = it.functionName.localHash // FIXME: add signature
             // TODO: compile-time resolution limits binary compatibility
             val methodEntryPoint = it.implementation.entryPointAddress
             MethodTableRecord(nameSignature, methodEntryPoint)