Make classes and structures in core/loader fast-allocated.

Source/core/loader/ThreadableLoader.h

Index: Source/core/loader/ThreadableLoader.h
diff --git a/Source/core/loader/ThreadableLoader.h b/Source/core/loader/ThreadableLoader.h
index e48f842e36da137ccf8d532a5c563034211af258..c45d4309225682cdd278d0882549f5b5fad558eb 100644
--- a/Source/core/loader/ThreadableLoader.h
+++ b/Source/core/loader/ThreadableLoader.h
@@ -34,6 +34,7 @@
 #include "core/CoreExport.h"
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "platform/CrossThreadCopier.h"
+#include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
@@ -63,6 +64,7 @@ enum ContentSecurityPolicyEnforcement {
 };
 
 struct ThreadableLoaderOptions {
+    DISALLOW_ALLOCATION();
     ThreadableLoaderOptions()
         : preflightPolicy(ConsiderPreflight)
         , crossOriginRequestPolicy(DenyCrossOriginRequests)
@@ -80,6 +82,7 @@ struct ThreadableLoaderOptions {
 
 // Encode AtomicString as String to cross threads.
 struct CrossThreadThreadableLoaderOptionsData {
+    STACK_ALLOCATED();
     explicit CrossThreadThreadableLoaderOptionsData(const ThreadableLoaderOptions& options)
         : preflightPolicy(options.preflightPolicy)
         , crossOriginRequestPolicy(options.crossOriginRequestPolicy)