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/PowerPC/iabs.ll b/test/CodeGen/PowerPC/iabs.ll
index 595e355..7d089bb 100644
--- a/test/CodeGen/PowerPC/iabs.ll
+++ b/test/CodeGen/PowerPC/iabs.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=ppc32 -stats |& \
+; RUN: llc < %s -march=ppc32 -stats 2>&1 | \
 ; RUN:   grep "4 .*Number of machine instrs printed"
 
 ;; Integer absolute value, should produce something as good as: