Add a test for the new null keyword

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@669 91177308-0d34-0410-b5e6-96231b3b80d8

test/Feature/testconstants.ll

@@ -10,14 +10,20 @@ begin
 	ret [[2x int]]* %array
 end
 
-
 [sbyte]* "other func"(int, double)
 begin
 	ret [sbyte]* %somestr
 end
 
+[sbyte]* "yet another func"(int, double)
+begin
+	ret [sbyte]* null            ; Test null
+end
+
+
 [sbyte]* "again"(float)
 begin
 	%cast = cast [11x sbyte]* %somestr to [sbyte]*
 	ret [sbyte]* %cast
 end
+