Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.

llvm-svn: 81537
diff --git a/llvm/test/Transforms/SimplifyLibCalls/abs.ll b/llvm/test/Transforms/SimplifyLibCalls/abs.ll
index 637d335..6fbe0b9 100644
--- a/llvm/test/Transforms/SimplifyLibCalls/abs.ll
+++ b/llvm/test/Transforms/SimplifyLibCalls/abs.ll
@@ -1,4 +1,4 @@
-; RUN: opt %s -simplify-libcalls -S | grep {select i1 %ispos}
+; RUN: opt < %s -simplify-libcalls -S | grep {select i1 %ispos}
 ; PR2337
 
 define i32 @test(i32 %x) {