Reapply "Lazy deopt without code patching."

runtime/vm/instructions_dbc.h

Index: runtime/vm/instructions_dbc.h
diff --git a/runtime/vm/instructions_dbc.h b/runtime/vm/instructions_dbc.h
index 6db52052bc284427f4bc1694db642ab574b1faca..a10dcc0a62002cb24cc6c57cad35ad413968cf07 100644
--- a/runtime/vm/instructions_dbc.h
+++ b/runtime/vm/instructions_dbc.h
@@ -57,12 +57,7 @@ class CallPattern : public ValueObject {
   RawCode* TargetCode() const;
   void SetTargetCode(const Code& code) const;
 
-  // This constant length is only valid for inserted call patterns used for
-  // lazy deoptimization. Regular call pattern may vary in length.
-  static int DeoptCallPatternLengthInBytes();
-  static int DeoptCallPatternLengthInInstructions();
-
-  static void InsertDeoptCallAt(uword pc, uword target_address);
+  static void InsertDeoptCallAt(uword pc);
 
  private:
   const ObjectPool& object_pool_;