Roll clang to 9913fb19.
Roll clang to 9913fb19.

AKA roll clang 287685:295762.

Change-Id: Ie74172a1986908eeca2f913f7c4500cc51095e1b
Reviewed-on: https://pdfium-review.googlesource.com/2870
Commit-Queue: Lei Zhang <79648d9aca10df37c1b962af0b65ebfac3e19883@chromium.org>
Reviewed-by: Nico Weber <c0f02d98506190746d1cdcb01be0f37b51e27077@chromium.org>

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium