GitLab

Update clang_version from 7.0.0 to 8.0.0 and remove the code to remove
the old library directory.

Remove the _LIBCPP_HIDE_FROM_ABI define, it is no longer needed.

Bug: 871418, 872926
Change-Id: Ic02dcfbf17c4190fc4359271d880b7e65bf7ba27
Reviewed-on: https://chromium-review.googlesource.com/1182196
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586816}