new testcase

llvm-svn: 21714
diff --git a/llvm/test/Regression/Transforms/InstCombine/shift.ll b/llvm/test/Regression/Transforms/InstCombine/shift.ll
index e4f1bfb..fd1ac0e 100644
--- a/llvm/test/Regression/Transforms/InstCombine/shift.ll
+++ b/llvm/test/Regression/Transforms/InstCombine/shift.ll
@@ -158,3 +158,9 @@
 	ret bool %C
 }
 
+sbyte %test23(int %A) {
+	%B = shl int %A, ubyte 24  ;; casts not needed
+	%C = shr int %B, ubyte 24
+	%D = cast int %C to sbyte
+	ret sbyte %D
+}