Fix test failure introduced in r187271 by enabling pipefail.

llvm-svn: 187381

lld/lib/Passes/LayoutPass.cpp

@@ -433,7 +433,7 @@ void showCycleDetectedError(AtomToAtomT &followOnNexts,
     }
     atom = followOnNexts[atom];
   } while (atom != start);
-  llvm_unreachable("Cycle detected");
+  llvm::report_fatal_error("Cycle detected");
 }
 
 /// Exit if there's a cycle in a followon chain reachable from the

lld/test/layout-error-test.objtxt

@@ -1,6 +1,7 @@
 # REQUIRES: debug
-# RUN: lld -core --add-pass layout -mllvm -debug-only=LayoutPass %s 2>&1 \
-# RUN:   | FileCheck %s -check-prefix=CHECK
+# RUN: not lld -core --add-pass layout -mllvm -debug-only=LayoutPass \
+# RUN:   %s 2> %t.err
+# RUN:   FileCheck %s -check-prefix=CHECK < %t.err
 
 ---
 defined-atoms: