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Wild pointer accesses that unintentionally access the GWP-ASan region
and cause a false-positive report are far more prevalent on 32-bit than
64-bit because the address space is smaller. One of the leading causes
of false positive reports on 64-bit is when the OS maps the GWP-ASan
region into the lower 32-bits. Provide a hint to mmap/VirtualAlloc to
map the GWP-ASan region above the first 32-bits of address space.

Bug: 969146
Change-Id: I04a436808290e4d8674af8e2cf2484d1ed8ee470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648694
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667322}