Make compilation VM tags more fine grained

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 4e6182335fe4a3185e5f1996f927567ef31e0ed8..ac4d44e0edffd9dbbff2fbbf3e7153a5a1fd9be3 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -381,7 +381,7 @@ void Parser::ParseCompilationUnit(const Library& library,
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate->long_jump_base()->IsSafeToJump());
   TimerScope timer(FLAG_compiler_stats, &CompilerStats::parser_timer);
-  VMTagScope tagScope(isolate, VMTag::kCompileTagId);
+  VMTagScope tagScope(isolate, VMTag::kCompileTopLevelTagId);
   Parser parser(script, library, 0);
   parser.ParseTopLevel();
 }
@@ -730,7 +730,7 @@ static bool HasReturnNode(SequenceNode* seq) {
 void Parser::ParseClass(const Class& cls) {
   if (!cls.is_synthesized_class()) {
     Isolate* isolate = Isolate::Current();
-    VMTagScope tagScope(isolate, VMTag::kCompileTagId);
+    VMTagScope tagScope(isolate, VMTag::kCompileTopLevelTagId);
     TimerScope timer(FLAG_compiler_stats, &CompilerStats::parser_timer);
     ASSERT(isolate->long_jump_base()->IsSafeToJump());
     const Script& script = Script::Handle(isolate, cls.script());
@@ -789,7 +789,7 @@ RawObject* Parser::ParseFunctionParameters(const Function& func) {
 
 void Parser::ParseFunction(ParsedFunction* parsed_function) {
   Isolate* isolate = Isolate::Current();
-  VMTagScope tagScope(isolate, VMTag::kCompileTagId);
+  VMTagScope tagScope(isolate, VMTag::kCompileTopLevelTagId);
   TimerScope timer(FLAG_compiler_stats, &CompilerStats::parser_timer);
   CompilerStats::num_functions_compiled++;
   ASSERT(isolate->long_jump_base()->IsSafeToJump());