Fix g++ -pedantic warnings

src/IceInst.h

Index: src/IceInst.h
diff --git a/src/IceInst.h b/src/IceInst.h
index 3067c2658a7532739044b1c9b496ef8961eeab61..fd0eeea9d76b6908bf8791c9f019ab25424b81ce 100644
--- a/src/IceInst.h
+++ b/src/IceInst.h
@@ -161,6 +161,7 @@ public:
 #define X(tag, str, commutative) tag,
     ICEINSTARITHMETIC_TABLE
 #undef X
+        _num
   };
 
   static InstArithmetic *create(Cfg *Func, OpKind Op, Variable *Dest,
@@ -287,6 +288,7 @@ public:
 #define X(tag, str) tag,
     ICEINSTCAST_TABLE
 #undef X
+        _num
   };
 
   static InstCast *create(Cfg *Func, OpKind CastKind, Variable *Dest,
@@ -314,6 +316,7 @@ public:
 #define X(tag, str) tag,
     ICEINSTFCMP_TABLE
 #undef X
+        _num
   };
 
   static InstFcmp *create(Cfg *Func, FCond Condition, Variable *Dest,
@@ -342,6 +345,7 @@ public:
 #define X(tag, str) tag,
     ICEINSTICMP_TABLE
 #undef X
+        _num
   };
 
   static InstIcmp *create(Cfg *Func, ICond Condition, Variable *Dest,