Merged r16772, r18000, r18298, r18319 into 3.21 branch.

src/deoptimizer.h

Index: src/deoptimizer.h
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 7ee5908f7621b7e22de1b9f802b52a56a0c364b7..4e41a44de44c9af0f93515ed6a758d489fd0d46d 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -449,6 +449,10 @@ class Deoptimizer : public Malloced {
   // at the dynamic alignment state slot inside the frame.
   bool HasAlignmentPadding(JSFunction* function);
 
+  // Select the version of NotifyStubFailure builtin that either saves or
+  // doesn't save the double registers depending on CPU features.
+  Code* NotifyStubFailureBuiltin();
+
   Isolate* isolate_;
   JSFunction* function_;
   Code* compiled_code_;