Merged r19545, r19668, r19670 into 3.24 branch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 265f06523462eb73c93245fca2867d79a074dd0a..41dbb4e0b0ce41607b6a945492c47ea1ce07686d 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1566,6 +1566,7 @@ class HCompareMap V8_FINAL : public HUnaryControlInstruction {
       : HUnaryControlInstruction(value, true_target, false_target),
         known_successor_index_(kNoKnownSuccessorIndex), map_(Unique<Map>(map)) {
     ASSERT(!map.is_null());
+    set_representation(Representation::Tagged());
   }
 
   int known_successor_index_;