Revert of [compiler] Properly guard the speculative optimizations for instanceof.

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index c4808ca840500bd89c9c4b1498d2f5f16733ad2e..18e88310002a7ba497e1f2fa4356db68c445408c 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -735,16 +735,12 @@
   // Feedback vector slot is only used by interpreter for binary operations.
   // Full-codegen uses AstId to record type feedback.
   switch (op()) {
+    // instanceof and in do not collect type feedback.
     case Token::INSTANCEOF:
-      // instanceof collects feedback in a general slot (for now).
-      type_feedback_slot_ = spec->AddGeneralSlot();
-      return;
     case Token::IN:
-      // in does not collect type feedback.
       return;
     default:
       type_feedback_slot_ = spec->AddInterpreterCompareICSlot();
-      return;
   }
 }