Delete HAbnormalExit. It does more harm than good.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 773ba3bc25f97918c3b72c0245a6da92488b489d..fcd3c733cae22795f4dba6d53f8b6aba1ab776d7 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -63,7 +63,6 @@ class LChunkBuilder;
 
 
 #define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V)  \
-  V(AbnormalExit)                              \
   V(AccessArgumentsAt)                         \
   V(Add)                                       \
   V(Allocate)                                  \
@@ -1443,16 +1442,6 @@ class HReturn V8_FINAL : public HTemplateControlInstruction<0, 3> {
 };
 
 
-class HAbnormalExit V8_FINAL : public HTemplateControlInstruction<0, 0> {
- public:
-  virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
-    return Representation::None();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(AbnormalExit)
-};
-
-
 class HUnaryOperation : public HTemplateInstruction<1> {
  public:
   HUnaryOperation(HValue* value, HType type = HType::Tagged())