Devirtualize Parser

* src/parser.h: No one inherits from Parser, so the destructor can be
  non-virtual, removing the need for Parser to have a vtable. Also add
  BASE_EMBEDDED to it and to RegExpParser.

BUG=

Review URL: https://codereview.chromium.org/13640007
Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14162 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/parser.h

@@ -293,7 +293,7 @@ class RegExpBuilder: public ZoneObject {
 };
 
 
-class RegExpParser {
+class RegExpParser BASE_EMBEDDED {
  public:
   RegExpParser(FlatStringReader* in,
                Handle<String>* error,
@@ -423,10 +423,10 @@ class RegExpParser {
 // Forward declaration.
 class SingletonLogger;
 
-class Parser {
+class Parser BASE_EMBEDDED {
  public:
   explicit Parser(CompilationInfo* info);
-  virtual ~Parser() {
+  ~Parser() {
     delete reusable_preparser_;
     reusable_preparser_ = NULL;
   }