Rolling v8/build to 7580e8854eb309008f00f115ea0adb13dac454a4

Rolling v8/buildtools to 4dcb5ed1079e7a527061925637b8cc627e289e82

Rolling v8/tools/clang to ea64c667cd841b2c3268bd7dfd223269f3ea23ba

Rolling v8/tools/gyp to 35eafcd939515d51d19556c543f9cf97faf75ee6

Rolling v8/tools/mb to 8b4a59c463a697a3e418c28e85f534e87337ba7f

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

Review-Url: https://codereview.chromium.org/2078333005
Cr-Commit-Position: refs/heads/master@{#37121}