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

Source/core/html/parser/HTMLEntitySearch.h

Index: Source/core/html/parser/HTMLEntitySearch.h
diff --git a/Source/core/html/parser/HTMLEntitySearch.h b/Source/core/html/parser/HTMLEntitySearch.h
index 6d12fd3ecc77dbd83fa2e1a582a4f5c26a57dc35..31b70a30facf4272f210955bb3b1c8df335fc04a 100644
--- a/Source/core/html/parser/HTMLEntitySearch.h
+++ b/Source/core/html/parser/HTMLEntitySearch.h
@@ -26,6 +26,7 @@
 #ifndef HTMLEntitySearch_h
 #define HTMLEntitySearch_h
 
+#include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -33,6 +34,7 @@ namespace blink {
 struct HTMLEntityTableEntry;
 
 class HTMLEntitySearch {
+    STACK_ALLOCATED();
 public:
     HTMLEntitySearch();