Ensure that all goto instructions have deoptimization target.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index b47092451d4cc448c7540a30c4073f2cb5ba9831..1db01c5c5ab28ac12db4d082ef5d5cdc482f4ce1 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2393,8 +2393,7 @@ class PcDescriptors : public Object {
 
  public:
   enum Kind {
-    kDeoptBefore = 0,  // Deoptimization continuation point before instruction.
-    kDeoptAfter,       // Deoptimization continuation point after instruction.
+    kDeopt,            // Deoptimization continuation point.
     kEntryPatch,       // Location where to patch entry.
     kPatchCode,        // Buffer for patching code entry.
     kLazyDeoptJump,    // Lazy deoptimization trampoline.
@@ -2810,9 +2809,6 @@ class Code : public Object {
   uword GetPatchCodePc() const;
   uword GetLazyDeoptPc() const;
 
-  uword GetDeoptBeforePcAtDeoptId(intptr_t deopt_id) const;
-  uword GetDeoptAfterPcAtDeoptId(intptr_t deopt_id) const;
-
   uword GetPcForDeoptId(intptr_t deopt_id, PcDescriptors::Kind kind) const;
 
   // Returns true if there is an object in the code between 'start_offset'