Fix a test failure in pass manager test
authorqining <qining@google.com>
Thu, 28 Jul 2016 19:30:37 +0000 (15:30 -0400)
committerqining <qining@google.com>
Thu, 28 Jul 2016 19:30:37 +0000 (15:30 -0400)
commit4750895943841278c8aef316be4a81b56a6ad3d8
treef528915e85cf6268be4b5f949bfa5e7b6ca16312
parenta24506266bbdb849785678402d247c43acd234e7
Fix a test failure in pass manager test

Change "Null" to "null" in pass manager test
test/opt/test_pass_manager.cpp