Implement instance field guards for kernel-based FlowGraphBuilder

runtime/vm/kernel_to_il.h

Index: runtime/vm/kernel_to_il.h
diff --git a/runtime/vm/kernel_to_il.h b/runtime/vm/kernel_to_il.h
index 20b9aeb095a5375925acf16ea8e87875eb564567..4ad3ce142a7167f4b3220183b69d17bba8feee1c 100644
--- a/runtime/vm/kernel_to_il.h
+++ b/runtime/vm/kernel_to_il.h
@@ -708,6 +708,7 @@ class FlowGraphBuilder : public TreeVisitor {
   Fragment StaticCall(const Function& target, intptr_t argument_count,
                       const Array& argument_names);
   Fragment StoreIndexed(intptr_t class_id);
+  Fragment StoreInstanceFieldGuarded(const dart::Field& field);
   Fragment StoreInstanceField(const dart::Field& field);
   Fragment StoreInstanceField(intptr_t offset);
   Fragment StoreLocal(LocalVariable* variable);
@@ -716,6 +717,8 @@ class FlowGraphBuilder : public TreeVisitor {
   Fragment ThrowTypeError();
   Fragment ThrowNoSuchMethodError();
   Fragment BuildImplicitClosureCreation(const Function& target);
+  Fragment GuardFieldLength(const dart::Field& field, intptr_t deopt_id);
+  Fragment GuardFieldClass(const dart::Field& field, intptr_t deopt_id);
 
   dart::RawFunction* LookupMethodByMember(Member* target,
                                           const dart::String& method_name);