[compiler] Sidestep optimizing of generator resumers.

src/runtime/runtime-generator.cc

Index: src/runtime/runtime-generator.cc
diff --git a/src/runtime/runtime-generator.cc b/src/runtime/runtime-generator.cc
index dab0621592efffc37d655b13da0012efcd2f3a2d..f7be0eb60b75ad963ac6d3db3c2622f4f50c1261 100644
--- a/src/runtime/runtime-generator.cc
+++ b/src/runtime/runtime-generator.cc
@@ -203,26 +203,23 @@ RUNTIME_FUNCTION(Runtime_GeneratorGetSourcePosition) {
   return isolate->heap()->undefined_value();
 }
 
-
-// Optimization for the following three functions is disabled in
-// js/generator.js and compiler/ast-graph-builder.cc.
-
+// Optimization for builtins calling any of the following three functions is
+// disabled in js/generator.js and compiler.cc, hence they are unreachable.
 
 RUNTIME_FUNCTION(Runtime_GeneratorNext) {
   UNREACHABLE();
   return nullptr;
 }
 
-
 RUNTIME_FUNCTION(Runtime_GeneratorReturn) {
   UNREACHABLE();
   return nullptr;
 }
 
-
 RUNTIME_FUNCTION(Runtime_GeneratorThrow) {
   UNREACHABLE();
   return nullptr;
 }
+
 }  // namespace internal
 }  // namespace v8