llvm-next: add nostart-stop-gc to the list of flags.

This functionality causes problems for several packages and it
seems to be only of importance for instrumented profiling which
we don't use.

BUG=b:187743526
TEST=CQ

Change-Id: I441b96223dc8e09eb113608b85cde918faf2753f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2943079
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Commit-Queue: Luis Lozano <llozano@chromium.org>
Auto-Submit: Luis Lozano <llozano@chromium.org>
7 files changed