new testcase

llvm-svn: 21135
diff --git a/llvm/test/Regression/Transforms/InstCombine/add.ll b/llvm/test/Regression/Transforms/InstCombine/add.ll
index c971563..f061093 100644
--- a/llvm/test/Regression/Transforms/InstCombine/add.ll
+++ b/llvm/test/Regression/Transforms/InstCombine/add.ll
@@ -191,3 +191,8 @@
         ret int %D
 }
 
+int %test28(int %X) {
+	%Y = add int %X, 1234
+	%Z = sub int 42, %Y
+	ret int %Z
+}