[DNM] Add some debugging for failing test

Author: bnbarham

test/Incremental/Fingerprints/class-fingerprint.swift

@@ -6,11 +6,13 @@
 // RUN: %empty-directory(%t)
 // RUN: cp %S/Inputs/class-fingerprint/* %t
 // RUN: cp %t/definesAB{-before,}.swift
+// RUN: cd %t
 
 // Seeing weird failure on CI, so set the mod times
 // RUN: touch -t 200101010101 %t/*.swift
 
-// RUN: cd %t && %swiftc_driver-stdlib-target -enable-batch-mode -j2 -incremental -driver-show-incremental main.swift definesAB.swift usesA.swift usesB.swift -module-name main -output-file-map ofm.json >&output3
+// RUN: not %swiftc_driver-stdlib-target -enable-batch-mode -j2 -incremental -driver-show-incremental main.swift definesAB.swift usesA.swift usesB.swift -module-name main -output-file-map ofm.json >&output3
+// RUN: cat output3
 
 // only-run-for-debugging: cp %t/usesB.swiftdeps %t/usesB3.swiftdeps
 
@@ -24,7 +26,8 @@
 // RUN: touch -t 200101010101 %t/*.swift
 // RUN: touch -t 200301010101 %t/definesAB.swift
 
-// RUN: cd %t && %swiftc_driver-stdlib-target -enable-batch-mode -j2 -incremental -driver-show-incremental main.swift definesAB.swift usesA.swift usesB.swift -module-name main -output-file-map ofm.json >&output4
+// RUN: not %swiftc_driver-stdlib-target -enable-batch-mode -j2 -incremental -driver-show-incremental main.swift definesAB.swift usesA.swift usesB.swift -module-name main -output-file-map ofm.json >&output4
+// RUN: cat output4
 
 // only-run-for-debugging: cp %t/usesB.swiftdeps %t/usesB4.swiftdeps