Reapply "Lazy deopt without code patching."

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 6f0f16472e248b3bddd20d37e062b2055ceaa405..c0024b9cea9b6304a2a260873056371036236046 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -14229,8 +14229,6 @@ RawCode* Code::New(intptr_t pointer_offsets_length) {
     result.set_is_alive(false);
     result.set_comments(Comments::New(0));
     result.set_compile_timestamp(0);
-    result.set_lazy_deopt_return_pc_offset(kInvalidPc);
-    result.set_lazy_deopt_throw_pc_offset(kInvalidPc);
     result.set_pc_descriptors(Object::empty_descriptors());
   }
   return result.raw();
@@ -14544,18 +14542,6 @@ void Code::SetActiveInstructions(RawInstructions* instructions) const {
 }
 
 
-uword Code::GetLazyDeoptReturnPc() const {
-  return (lazy_deopt_return_pc_offset() != kInvalidPc)
-      ? PayloadStart() + lazy_deopt_return_pc_offset() : 0;
-}
-
-
-uword Code::GetLazyDeoptThrowPc() const {
-  return (lazy_deopt_throw_pc_offset() != kInvalidPc)
-      ? PayloadStart() + lazy_deopt_throw_pc_offset() : 0;
-}
-
-
 RawStackmap* Code::GetStackmap(
     uint32_t pc_offset, Array* maps, Stackmap* map) const {
   // This code is used during iterating frames during a GC and hence it