Fix --dcheck-always-on handling in v8testing
Fix --dcheck-always-on handling in v8testing

BUG=none
TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/776563006

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@293266 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build