Revert "Fixed bugs in "FastVector" class." This reverts commit 94ff37bb2110f838b92c5bae22a657982ccb48ff. Alternative fix will be in the follow up CL. Bug: angleproject:8021 Bug: chromium:1417087 Change-Id: Ib34cd14b6cf36f474cc0ae09605ef1490aed82f8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4328285 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>