[AA] do not try to build KtSymbol for FirErrorFunction

^KTIJ-23669
FirErrorFunctions are created for unknown labels
when the code in return statements is not complete yet.
Such labels cannot be resolved, and no symbols should be created for them

analysis/analysis-api/testData/referenceResolve/withErrors/ByReturnExpression.kt

@@ -0,0 +1,8 @@
+// UNRESOLVED_REFERENCE
+fun bar(block: () -> Unit) {}
+
+fun foo() {
+    bar {
+        return@<caret>b
+    }
+}