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/Verifier/invoke.ll b/test/Verifier/invoke.ll
index 2a0336b..06f40f0 100644
--- a/test/Verifier/invoke.ll
+++ b/test/Verifier/invoke.ll
@@ -1,4 +1,4 @@
-; RUN: not llvm-as < %s -o /dev/null |& FileCheck %s
+; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
 
 ; PR1042
 define i32 @foo() {