Fix cross-plat build failure

Thomas Moore (CHAKRA) · Thomas Moore (CHAKRA) · commit 2d528c9448be · 2018-11-15T14:50:12.000-08:00
diff --git a/lib/Jsrt/Jsrt.cpp b/lib/Jsrt/Jsrt.cpp
@@ -3980,7 +3980,7 @@ JsErrorCode RunSerializedScriptCore(
                 bgParseCookie,
                 nullptr, // pszSrc
                 hsi,
-                (Js::ParseableFunctionInfo**)(&functionBody),
+                (Field(Js::ParseableFunctionInfo**))(&functionBody),
                 nullptr, // pse
                 srcLength,
                 nullptr, // utf8sourceinfo
