- Refactor Symbol allocation to expect a thread parameter.

runtime/vm/ast_transformer.cc

Index: runtime/vm/ast_transformer.cc
diff --git a/runtime/vm/ast_transformer.cc b/runtime/vm/ast_transformer.cc
index 2137931d3acd75f4b2a66044a748573e861fa421..a81babbdaf2dd78b7809fb57e09bed2b385e678e 100644
--- a/runtime/vm/ast_transformer.cc
+++ b/runtime/vm/ast_transformer.cc
@@ -10,6 +10,9 @@
 
 namespace dart {
 
+// Quick access to the current thread.
+#define T (thread())
+
 // Quick access to the current zone.
 #define Z (thread()->zone())
 
@@ -66,8 +69,8 @@ AstNode* AwaitTransformer::Transform(AstNode* expr) {
 
 LocalVariable* AwaitTransformer::EnsureCurrentTempVar() {
   String& symbol =
-      String::ZoneHandle(Z, Symbols::NewFormatted("%d", temp_cnt_));
-  symbol = Symbols::FromConcat(Symbols::AwaitTempVarPrefix(), symbol);
+      String::ZoneHandle(Z, Symbols::NewFormatted(T, "%d", temp_cnt_));
+  symbol = Symbols::FromConcat(T, Symbols::AwaitTempVarPrefix(), symbol);
   ASSERT(!symbol.IsNull());
   // Look up the variable in the scope used for async temp variables.
   LocalVariable* await_tmp = async_temp_scope_->LocalLookupVariable(symbol);