[MERGE #5223 @pleath] Re-enable deferral of functions declared in eval

Merge pull request #5223 from pleath:code-load

The change to deferral heuristics accidentally disabled this by not passing the proper flags to the parser.

Author: pleath

lib/Runtime/Library/GlobalObject.cpp

@@ -601,7 +601,7 @@ namespace Js
         bool found = useEvalMap && scriptContext->IsInEvalMap(key, isIndirect, &pfuncScript);
         if (!found || (!isIndirect && pfuncScript->GetEnvironment() != &NullFrameDisplay))
         {
-            uint32 grfscr = additionalGrfscr | fscrReturnExpression | fscrEval | fscrEvalCode | fscrGlobalCode;
+            uint32 grfscr = additionalGrfscr | fscrReturnExpression | fscrEval | fscrEvalCode | fscrGlobalCode | fscrCanDeferFncParse;
 
             if (isLibraryCode)
             {

lib/Runtime/Library/JavascriptFunction.cpp

@@ -224,7 +224,7 @@ namespace Js
                     &Parser::ValidateSourceElementList);
             }
 
-            pfuncScript = scriptContext->GetGlobalObject()->EvalHelper(scriptContext, sourceString, sourceLen, moduleID, fscrNil, Constants::FunctionCode, TRUE, TRUE, strictMode);
+            pfuncScript = scriptContext->GetGlobalObject()->EvalHelper(scriptContext, sourceString, sourceLen, moduleID, fscrCanDeferFncParse, Constants::FunctionCode, TRUE, TRUE, strictMode);
 
             // Indicate that this is a top-level function. We don't pass the fscrGlobalCode flag to the eval helper,
             // or it will return the global function that wraps the declared function body, as though it were an eval.