V8 Buildbot: Fix ASAN builder's archive step.
V8 Buildbot: Fix ASAN builder's archive step.

Fix based on https://codereview.chromium.org/418283007/

TBR=hinoka@chromium.org
BUG=396865

Review URL: https://codereview.chromium.org/423383002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@286432 0039d316-1c4b-4281-b951-d872f2087c98

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