Subzero: Fix off-by-one asserts in intrinsic info lookup routines.

src/IceIntrinsics.h

Index: src/IceIntrinsics.h
diff --git a/src/IceIntrinsics.h b/src/IceIntrinsics.h
index 75e67aa70cd52cd39dc8b355eb353b1fecef041d..9270aa4a4f69541acb81e19caecbbcf90c482307 100644
--- a/src/IceIntrinsics.h
+++ b/src/IceIntrinsics.h
@@ -140,13 +140,13 @@ public:
 
     /// Returns the return type of the intrinsic.
     Type getReturnType() const {
-      assert(NumTypes > 1);
+      assert(NumTypes > 0);
       return Signature[0];
     }
 
     /// Returns number of arguments expected.
     SizeT getNumArgs() const {
-      assert(NumTypes > 1);
+      assert(NumTypes > 0);
       return NumTypes - 1;
     }