Reapply "Lazy deopt without code patching."

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index cef387ba0a522f5b8a497f6cb6b88680191b235d..984561693215044299677b81d4ae1d33908bba2f 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -1165,10 +1165,6 @@ class RawCode : public RawObject {
   // Alive: If true, the embedded object pointers will be visited during GC.
   int32_t state_bits_;
 
-  // PC offsets for code patching.
-  NOT_IN_PRECOMPILED(int32_t lazy_deopt_return_pc_offset_);
-  NOT_IN_PRECOMPILED(int32_t lazy_deopt_throw_pc_offset_);
-
   // Variable length data follows here.
   int32_t* data() { OPEN_ARRAY_START(int32_t, int32_t); }
   const int32_t* data() const { OPEN_ARRAY_START(int32_t, int32_t); }