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When GWP-ASan is used with 32-bit address spaces, false positives are
much more common because a random bad dereference is much more likely to
point into the GWP-ASan region. After several months, the Windows/x86
version of GWP-ASan has not found bugs we couldn't find with the 64-bit
only version so disable it to reduce false positives.

Bug: 969146
Change-Id: I9beaa01b428c2fa6495c10f634cf9e01c3d170d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696208
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677071}