[compiler] Move generator optimization heuristics.

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index 8a3d9430d4b1e421f3b31311d45721180a1295ac..4f9ffb2133ff54954c1a1819e1be6c296061c54e 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -579,6 +579,10 @@ bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
     DisableCrankshaft(kRestParameter);
   }
 
+  if (IsGeneratorFunction(node->kind()) || IsAsyncFunction(node->kind())) {
+    DisableOptimization(kGenerator);
+  }
+
   VisitDeclarations(scope->declarations());
   VisitStatements(node->body());