Fix memory leak in regexp macro assembler. If the buffer has been

expanded the macro assembler owns the buffer and needs to dispose it
in the destructor.
Review URL: http://codereview.chromium.org/126111

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2158 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/regexp-macro-assembler-irregexp.cc

@@ -47,6 +47,7 @@ RegExpMacroAssemblerIrregexp::RegExpMacroAssemblerIrregexp(Vector<byte> buffer)
 
 RegExpMacroAssemblerIrregexp::~RegExpMacroAssemblerIrregexp() {
   if (backtrack_.is_linked()) backtrack_.Unuse();
+  if (own_buffer_) buffer_.Dispose();
 }