New testcase for bug

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2626 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/2002-05-14-SubFailure.ll

@@ -0,0 +1,14 @@
+; Instcombine was missing a test that caused it to make illegal transformations
+; sometimes.  In this case, it transforms the sub into an add:
+; RUN: if as < %s | opt -instcombine | dis | grep add
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+;
+
+
+int "test"(int %i, int %j) {
+	%A = mul int %i, %j
+	%B = sub int 2, %A
+	ret int %B
+}