don't use 'not' when we can use a positive test

llvm-svn: 35402

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

@@ -1,12 +1,10 @@
 ; Instcombine was missing a test that caused it to make illegal transformations
 ; sometimes.  In this case, it transforms the sub into an add:
-; RUN: echo foo
-; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | not grep add
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep sub
 ;
-
-
-int "test"(int %i, int %j) {
-	%A = mul int %i, %j
-	%B = sub int 2, %A
-	ret int %B
+define i32 @test(i32 %i, i32 %j) {
+        %A = mul i32 %i, %j
+        %B = sub i32 2, %A
+        ret i32 %B
 }
+