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

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
===================================================================
--- runtime/vm/flow_graph_compiler.cc	(revision 35455)
+++ runtime/vm/flow_graph_compiler.cc	(working copy)
@@ -476,7 +476,7 @@
   ASSERT(is_optimizing());
   CompilerDeoptInfo* info =
       new CompilerDeoptInfo(deopt_id,
-                            kDeoptAtCall,
+                            ICData::kDeoptAtCall,
                             pending_deoptimization_env_);
   info->set_pc_offset(assembler()->CodeSize());
   deopt_infos_.Add(info);
@@ -633,7 +633,7 @@
 
 
 Label* FlowGraphCompiler::AddDeoptStub(intptr_t deopt_id,
-                                       DeoptReasonId reason) {
+                                       ICData::DeoptReasonId reason) {
   ASSERT(is_optimizing_);
   CompilerDeoptInfoWithStub* stub =
       new CompilerDeoptInfoWithStub(deopt_id,
@@ -772,7 +772,7 @@
   ASSERT(FLAG_propagate_ic_data || (ic_data.NumberOfChecks() == 0));
   uword label_address = 0;
   if (is_optimizing() && (ic_data.NumberOfChecks() == 0)) {
-    if (ic_data.is_closure_call()) {
+    if (ic_data.IsClosureCall()) {
       // This IC call may be closure call only.
       label_address = StubCode::ClosureCallInlineCacheEntryPoint();
       ExternalLabel target_label("InlineCache", label_address);
@@ -786,7 +786,7 @@
     ASSERT(!is_optimizing()
            || may_reoptimize()
            || flow_graph().IsCompiledForOsr());
-    switch (ic_data.num_args_tested()) {
+    switch (ic_data.NumArgsTested()) {
       case 1:
         label_address = StubCode::OneArgOptimizedCheckInlineCacheEntryPoint();
         break;
@@ -812,7 +812,7 @@
     return;
   }
 
-  switch (ic_data.num_args_tested()) {
+  switch (ic_data.NumArgsTested()) {
     case 1:
       label_address = StubCode::OneArgCheckInlineCacheEntryPoint();
       break;
@@ -1289,7 +1289,7 @@
 // The expected number of elements to sort is less than 10.
 void FlowGraphCompiler::SortICDataByCount(const ICData& ic_data,
                                           GrowableArray<CidTarget>* sorted) {
-  ASSERT(ic_data.num_args_tested() == 1);
+  ASSERT(ic_data.NumArgsTested() == 1);
   const intptr_t len = ic_data.NumberOfChecks();
   sorted->Clear();