fix bug, after functionBody cleaned up, it's still accessing m_scriptContext

Author: leirocks

Lib/Runtime/Base/ScriptContext.cpp

@@ -600,7 +600,7 @@ namespace Js
                 // because otherwise ETW events might not get fired if a GC doesn't happen
                 // and the thread context isn't shut down cleanly (process detach case)
                 this->MapFunction([this](Js::FunctionBody* functionBody) {
-                    Assert(functionBody->GetScriptContext() == this);
+                    Assert(functionBody->GetScriptContext() == nullptr || functionBody->GetScriptContext() == this);
                     functionBody->Cleanup(/* isScriptContextClosing */ true);
                 });
             }

Lib/Runtime/Library/ScriptFunction.cpp

@@ -594,7 +594,7 @@ namespace Js
                     {
                         memset(this->m_inlineCaches[i], 0, sizeof(InlineCache));
                     }
-                    else if(!scriptContext->IsClosed())
+                    else if(scriptContext != nullptr && !scriptContext->IsClosed())
                     {
                         if (inlineCache->RemoveFromInvalidationList())
                         {