[FIR] Introduce separate getTopLevelFunction/PropertySymbols

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/resolve/providers/impl/FirBuiltinSymbolProvider.kt

@@ -237,6 +237,17 @@ class FirBuiltinSymbolProvider(session: FirSession, val kotlinScopeProvider: Kot
         }
     }
 
+    @FirSymbolProviderInternals
+    override fun getTopLevelFunctionSymbolsTo(destination: MutableList<FirNamedFunctionSymbol>, packageFqName: FqName, name: Name) {
+        allPackageFragments[packageFqName]?.flatMapTo(destination) {
+            it.getTopLevelFunctionSymbols(name)
+        }
+    }
+
+    @FirSymbolProviderInternals
+    override fun getTopLevelPropertySymbolsTo(destination: MutableList<FirPropertySymbol>, packageFqName: FqName, name: Name) {
+    }
+
     private class BuiltInsPackageFragment(
         stream: InputStream, val fqName: FqName, val session: FirSession,
         val kotlinScopeProvider: KotlinScopeProvider,
@@ -297,6 +308,10 @@ class FirBuiltinSymbolProvider(session: FirSession, val kotlinScopeProvider: Kot
         }
 
         fun getTopLevelCallableSymbols(name: Name): List<FirCallableSymbol<*>> {
+            return getTopLevelFunctionSymbols(name)
+        }
+
+        fun getTopLevelFunctionSymbols(name: Name): List<FirNamedFunctionSymbol> {
             return packageProto.`package`.functionList.filter { nameResolver.getName(it.name) == name }.map {
                 memberDeserializer.loadFunction(it).symbol
             }