For background compilation we copy ICData so that it is immutable during comnpilation. However, we …

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
diff --git a/runtime/vm/assembler_mips.cc b/runtime/vm/assembler_mips.cc
index 9f63660788dc3054a566d1424efdd35440bc9ad3..0f15e3fd5aa59918168fb7d130d65a0ba4704011 100644
--- a/runtime/vm/assembler_mips.cc
+++ b/runtime/vm/assembler_mips.cc
@@ -532,6 +532,7 @@ void Assembler::BranchLinkPatchable(const StubEntry& stub_entry) {
 
 
 bool Assembler::CanLoadFromObjectPool(const Object& object) const {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   ASSERT(!Thread::CanLoadFromThread(object));
   if (!constant_pool_allowed()) {
     return false;
@@ -546,6 +547,7 @@ bool Assembler::CanLoadFromObjectPool(const Object& object) const {
 void Assembler::LoadObjectHelper(Register rd,
                                  const Object& object,
                                  bool is_unique) {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   ASSERT(!in_delay_slot_);
   if (Thread::CanLoadFromThread(object)) {
     // Load common VM constants from the thread. This works also in places where
@@ -603,6 +605,7 @@ void Assembler::LoadNativeEntry(Register rd,
 
 
 void Assembler::PushObject(const Object& object) {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   ASSERT(!in_delay_slot_);
   LoadObject(TMP, object);
   Push(TMP);
@@ -729,6 +732,7 @@ void Assembler::StoreIntoObjectNoBarrierOffset(Register object,
 void Assembler::StoreIntoObjectNoBarrier(Register object,
                                          const Address& dest,
                                          const Object& value) {
+  ASSERT(!value.IsICData() || ICData::Cast(value).IsOriginal());
   ASSERT(!in_delay_slot_);
   ASSERT(value.IsSmi() || value.InVMHeap() ||
          (value.IsOld() && value.IsNotTemporaryScopedHandle()));