Rolling v8/build to eef98eaf4956bbe8d24e5172acd1ffb44d0089a5

Rolling v8/tools/clang to cff206a88b16f784285391dcc4c444206f967024

Rolling v8/tools/mb to 8687d262d22fb2907b3be774c2643f27200aec62

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review-Url: https://codereview.chromium.org/2099593002
Cr-Commit-Position: refs/heads/master@{#37238}