FIR: Minor. Clarify naming for unwrapping overrides

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt

@@ -85,7 +85,7 @@ class FirSyntheticPropertiesScope(
     private fun FirFunctionSymbol<*>.hasJavaOverridden(): Boolean {
         var result = false
         baseScope.processOverriddenFunctionsAndSelf(this) {
-            if (it.unwrapOverridden().fir.origin == FirDeclarationOrigin.Enhancement) {
+            if (it.unwrapSubstitutionOverrides().fir.origin == FirDeclarationOrigin.Enhancement) {
                 result = true
                 ProcessorAction.STOP
             } else {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt

@@ -69,7 +69,7 @@ class FirClassSubstitutionScope(
         functionSymbol: FirFunctionSymbol<*>,
         processor: (FirFunctionSymbol<*>) -> ProcessorAction
     ): ProcessorAction {
-        val unwrapped = functionSymbol.unwrapOverriddenOnce()
+        val unwrapped = functionSymbol.overriddenSymbol as FirFunctionSymbol<*>? ?: functionSymbol
         return useSiteMemberScope.processOverriddenFunctions(unwrapped, processor)
     }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt

@@ -16,13 +16,7 @@ abstract class FirCallableSymbol<D : FirCallableDeclaration<D>> : AbstractFirBas
         get() = null
 }
 
-inline fun <reified E : FirCallableSymbol<*>> E.unwrapOverriddenOnce(): E {
-    overriddenSymbol?.let { return it as E }
-
-    return this
-}
-
-inline fun <reified E : FirCallableSymbol<*>> E.unwrapOverridden(): E {
+inline fun <reified E : FirCallableSymbol<*>> E.unwrapSubstitutionOverrides(): E {
     var current = this
     while (current.overriddenSymbol != null) {
         current = current.overriddenSymbol as E