Convert the uses of '|&' to use '2>&1 |' instead, which works on old
versions of Bash. In addition, I can back out the change to the lit
built-in shell test runner to support this.

This should fix the majority of fallout on Darwin, but I suspect there
will be a few straggling issues.

llvm-svn: 159544
diff --git a/llvm/test/Analysis/BasicAA/empty.ll b/llvm/test/Analysis/BasicAA/empty.ll
index 25927eb..dfc79f9 100644
--- a/llvm/test/Analysis/BasicAA/empty.ll
+++ b/llvm/test/Analysis/BasicAA/empty.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output |& FileCheck %s
+; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"