Use VM tag in profile and add stack trace trie

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 380565bc664165f06ac37d35032b30488288b1c4..2f9857f2fda703a5d1a5529da81ac7fedd9e172f 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -40,6 +40,7 @@
 #include "vm/scopes.h"
 #include "vm/stack_frame.h"
 #include "vm/symbols.h"
+#include "vm/tags.h"
 #include "vm/timer.h"
 #include "vm/unicode.h"
 
@@ -7364,17 +7365,19 @@ void Script::set_tokens(const TokenStream& value) const {
 
 
 void Script::Tokenize(const String& private_key) const {
-  const TokenStream& tkns = TokenStream::Handle(tokens());
+  Isolate* isolate = Isolate::Current();
+  const TokenStream& tkns = TokenStream::Handle(isolate, tokens());
   if (!tkns.IsNull()) {
     // Already tokenized.
     return;
   }
-
   // Get the source, scan and allocate the token stream.
+  VMTagScope tagScope(isolate, VMTag::kCompileTagId);
   TimerScope timer(FLAG_compiler_stats, &CompilerStats::scanner_timer);
-  const String& src = String::Handle(Source());
+  const String& src = String::Handle(isolate, Source());
   Scanner scanner(src, private_key);
-  set_tokens(TokenStream::Handle(TokenStream::New(scanner.GetStream(),
+  set_tokens(TokenStream::Handle(isolate,
+                                 TokenStream::New(scanner.GetStream(),
                                                   private_key)));
   if (FLAG_compiler_stats) {
     CompilerStats::src_length += src.Length();