Merged r18564, r19545, r19668, r19670 into 3.23 branch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 045ef932e1ebf94b1c0020a1feeddbf0c6805285..cf83928529c3134ec9c634d443bd7e30a88eb7ba 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1548,6 +1548,7 @@ class HCompareMap V8_FINAL : public HUnaryControlInstruction {
       : HUnaryControlInstruction(value, true_target, false_target),
         map_(Unique<Map>(map)) {
     ASSERT(!map.is_null());
+    set_representation(Representation::Tagged());
   }
 
   Unique<Map> map_;