Remember all deopt reasons in ic_data, not just the last one.

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
===================================================================
--- runtime/vm/flow_graph_compiler_mips.cc	(revision 35415)
+++ runtime/vm/flow_graph_compiler_mips.cc	(working copy)
@@ -1357,9 +1357,9 @@
                   num_args_checked));  // No arguments checked.
   ic_data.AddTarget(target_function);
   uword label_address = 0;
-  if (ic_data.num_args_tested() == 0) {
+  if (ic_data.NumArgsTested() == 0) {
     label_address = StubCode::ZeroArgsUnoptimizedStaticCallEntryPoint();
-  } else if (ic_data.num_args_tested() == 2) {
+  } else if (ic_data.NumArgsTested() == 2) {
     label_address = StubCode::TwoArgsUnoptimizedStaticCallEntryPoint();
   } else {
     UNIMPLEMENTED();