Add new testcase for arithmetic shr of -1

llvm-svn: 4069
diff --git a/llvm/test/Regression/Transforms/InstCombine/shift.ll b/llvm/test/Regression/Transforms/InstCombine/shift.ll
index c6a341f..5f7d2a5 100644
--- a/llvm/test/Regression/Transforms/InstCombine/shift.ll
+++ b/llvm/test/Regression/Transforms/InstCombine/shift.ll
@@ -37,3 +37,8 @@
 	%B = shl uint %A, ubyte 1   ;; convert to an add instruction
 	ret uint %B
 }
+
+int %test7(ubyte %A) {
+	%B = shr int -1, ubyte %A   ;; Always equal to -1
+	ret int %B
+}