[DrMemory] Suppress AllocationRegister guard page access
[DrMemory] Suppress AllocationRegister guard page access

The |AllocationRegister| death tests deliberately accesses a guard page
and expects the process to crash.

BUG=542501

Review URL: https://codereview.chromium.org/1404673002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353798}

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