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Until now the 1st page was uncommitted only on 32-bit architectures,
which looks like a mistake. It isn't used on 64-bit either and it should
be uncommitted there too, in order not to waste space.

Change-Id: I107dd8c064f92546bfaad01ea00747b721751172
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533214Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826674}