Allow debugger to stop when reading a static field

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
diff --git a/runtime/vm/flow_graph_builder.cc b/runtime/vm/flow_graph_builder.cc
index bf135624fb07337f4a2ea3895866d0e4c4fa2d95..c82a90f54ca1df1b2b3481254219bf25a7af4dd7 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -3364,7 +3364,7 @@ void EffectGraphVisitor::VisitStoreLocalNode(StoreLocalNode* node) {
     if (rhs->IsAssignableNode()) {
       rhs = rhs->AsAssignableNode()->expr();
     }
-    if ((rhs->IsLiteralNode() ||
+    if ((rhs->IsLiteralNode() || rhs->IsLoadStaticFieldNode() ||
          (rhs->IsLoadLocalNode() &&
           !rhs->AsLoadLocalNode()->local().IsInternal()) ||
          rhs->IsClosureNode()) &&
@@ -3476,7 +3476,7 @@ Definition* EffectGraphVisitor::BuildStoreStaticField(
       rhs = rhs->AsAssignableNode()->expr();
     }
     if ((rhs->IsLiteralNode() || rhs->IsLoadLocalNode() ||
-         rhs->IsClosureNode()) &&
+         rhs->IsLoadStaticFieldNode() || rhs->IsClosureNode()) &&
         node->token_pos().IsDebugPause()) {
       AddInstruction(new (Z) DebugStepCheckInstr(
           node->token_pos(), RawPcDescriptors::kRuntimeCall));
@@ -4207,6 +4207,7 @@ void EffectGraphVisitor::BuildThrowNode(ThrowNode* node) {
   if (FLAG_support_debugger) {
     if (node->exception()->IsLiteralNode() ||
         node->exception()->IsLoadLocalNode() ||
+        node->exception()->IsLoadStaticFieldNode() ||
         node->exception()->IsClosureNode()) {
       AddInstruction(new (Z) DebugStepCheckInstr(
           node->token_pos(), RawPcDescriptors::kRuntimeCall));