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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159544 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/label-redefinition.ll b/test/CodeGen/X86/label-redefinition.ll
index dece27b..9e88a18 100644
--- a/test/CodeGen/X86/label-redefinition.ll
+++ b/test/CodeGen/X86/label-redefinition.ll
@@ -1,5 +1,5 @@
 ; PR7054
-; RUN: not llc %s -o - |& grep "'_foo' label emitted multiple times to assembly"
+; RUN: not llc %s -o - 2>&1 | grep "'_foo' label emitted multiple times to assembly"
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
 target triple = "i386-apple-darwin10.0.0"