Change these tests to feed the assembly files to opt directly, instead
of using llvm-as, now that opt supports this.

llvm-svn: 81226
diff --git a/llvm/test/Transforms/LoopSimplify/2004-04-12-LoopSimplify-SwitchBackedges.ll b/llvm/test/Transforms/LoopSimplify/2004-04-12-LoopSimplify-SwitchBackedges.ll
index ae11d80..f8153fd 100644
--- a/llvm/test/Transforms/LoopSimplify/2004-04-12-LoopSimplify-SwitchBackedges.ll
+++ b/llvm/test/Transforms/LoopSimplify/2004-04-12-LoopSimplify-SwitchBackedges.ll
@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | opt -loopsimplify -disable-output
+; RUN: opt %s -loopsimplify -disable-output
 
 define void @test() {
 loopentry.0: