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/InstCombine/lshr-phi.ll b/llvm/test/Transforms/InstCombine/lshr-phi.ll
index 683eb87..3a5ccc3 100644
--- a/llvm/test/Transforms/InstCombine/lshr-phi.ll
+++ b/llvm/test/Transforms/InstCombine/lshr-phi.ll
@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
+; RUN: opt %s -instcombine | llvm-dis > %t
 ; RUN: not grep lshr %t
 ; RUN: grep add %t | count 1