Remove caller arguments from nested deoptimization environments.

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index f22a000d131b51b26f0d94b4979bed1170cfa2d2..f91eb1167bee3662660f60cd2f6b75c4e141841f 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -108,9 +108,8 @@ RawDeoptInfo* CompilerDeoptInfo::CreateDeoptInfo(FlowGraphCompiler* compiler) {
       builder.AddCopy(inner->LocationAt(i), *inner->ValueAt(i), slot_ix++);
     }
 
-    // Set the locals, not including the outgoing arguments.
-    ASSERT(current->Length() >= inner->fixed_parameter_count());
-    for (intptr_t i = current->Length() - inner->fixed_parameter_count() - 1;
+    // Set the locals, note that outgoing arguments are not in the environment.
+    for (intptr_t i = current->Length() - 1;
          i >= current->fixed_parameter_count();
          i--) {
       builder.AddCopy(current->LocationAt(i), *current->ValueAt(i), slot_ix++);