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This reverts commit 01602d56.

Reason for revert: /O1 is not the clang-cl equivalent of -O1 

Original change's description:
> [libFuzzer][Windows] Enable optimize_for_fuzzing
> 
> Bug: 890639
> Change-Id: Icb2be76982816119a30925fa92121445b5ca5141
> Reviewed-on: https://chromium-review.googlesource.com/c/1253023
> Reviewed-by: Max Moroz <mmoroz@chromium.org>
> Reviewed-by: Scott Graham <scottmg@chromium.org>
> Commit-Queue: Jonathan Metzman <metzman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596757}

TBR=thakis@chromium.org,scottmg@chromium.org,mmoroz@chromium.org,metzman@chromium.org

Change-Id: Ic407400440a3e6c58940b77708ab5334736242bb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 890639
Reviewed-on: https://chromium-review.googlesource.com/c/1264680Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597184}