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

runtime/vm/assembler_arm64.cc

Index: runtime/vm/assembler_arm64.cc
diff --git a/runtime/vm/assembler_arm64.cc b/runtime/vm/assembler_arm64.cc
index 14a51cd59aaffc245725650b49ed08ae41523ba1..062ad4b026942562e3c65b182b8cd013c52f5915 100644
--- a/runtime/vm/assembler_arm64.cc
+++ b/runtime/vm/assembler_arm64.cc
@@ -367,6 +367,7 @@ intptr_t Assembler::FindImmediate(int64_t imm) {
 
 
 bool Assembler::CanLoadFromObjectPool(const Object& object) const {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   ASSERT(!Thread::CanLoadFromThread(object));
   if (!constant_pool_allowed()) {
     return false;
@@ -401,6 +402,7 @@ void Assembler::LoadIsolate(Register dst) {
 void Assembler::LoadObjectHelper(Register dst,
                                  const Object& object,
                                  bool is_unique) {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   if (Thread::CanLoadFromThread(object)) {
     ldr(dst, Address(THR, Thread::OffsetFromThread(object)));
   } else if (CanLoadFromObjectPool(object)) {
@@ -439,6 +441,7 @@ void Assembler::LoadUniqueObject(Register dst, const Object& object) {
 
 
 void Assembler::CompareObject(Register reg, const Object& object) {
+  ASSERT(!object.IsICData() || ICData::Cast(object).IsOriginal());
   if (Thread::CanLoadFromThread(object)) {
     ldr(TMP, Address(THR, Thread::OffsetFromThread(object)));
     CompareRegisters(reg, TMP);
@@ -933,6 +936,7 @@ void Assembler::StoreIntoObjectOffsetNoBarrier(Register object,
 void Assembler::StoreIntoObjectNoBarrier(Register object,
                                          const Address& dest,
                                          const Object& value) {
+  ASSERT(!value.IsICData() || ICData::Cast(value).IsOriginal());
   ASSERT(value.IsSmi() || value.InVMHeap() ||
          (value.IsOld() && value.IsNotTemporaryScopedHandle()));
   // No store buffer update.