llvm: Fixes to make google3-stable build successfully.

These changes are necessary to make the Google3-stable version of
llvm (r404259) build an Eve image. This is (hopefully) part of
upgrading llvm-next to r404259.

BUG=chromium:1133468
TEST=Built Eve locally with llvm r404259 with these changes.

Change-Id: Iebe0085ee0a6b49f314385db2ed2d5b50b157c3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2438282
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
Auto-Submit: Caroline Tice <cmtice@chromium.org>
6 files changed