This reverts commit a6b95a6a.

Reason for revert:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Clusterfuzz%20Win64%20ASAN%20-%20release%20builder/6984

Original change's description:
> Reland "[build] disable C++ optimization for mksnapshot code."
> 
> This is a reland of cee2f772
> 
> Original change's description:
> > [build] disable C++ optimization for mksnapshot code.
> > 
> > By disabling C++ optimizations for code that's only run in mksnapshot,
> > that is, CSA and Torque-generated code, we can save compile time.
> > I observed up to 2x improvements of compile time for some files,
> > while the mksnapshot time did not increase significantly.
> > 
> > Bug: v8:7629
> > Change-Id: I96be2966611b2471b68023e0dd9e351d94f0013c
> > Reviewed-on: https://chromium-review.googlesource.com/c/1460941
> > Reviewed-by: Yang Guo <yangguo@chromium.org>
> > Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> > Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#59585}
> 
> Bug: v8:7629
> Change-Id: I8330f93173ab3d7b400e15ea4935bbe8256b250f
> Reviewed-on: https://chromium-review.googlesource.com/c/1473292
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59606}

TBR=yangguo@chromium.org,sigurds@chromium.org,tebbi@chromium.org

Change-Id: Ifdad207913a1814580c3055e57c6bfc2c6a53ae6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7629
Reviewed-on: https://chromium-review.googlesource.com/c/1473294Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59608}