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Also moves the config for this from //base -> //build/config/compiler
for symmetry with //build/config/compiler:wexit_time_destructors.

Bug: None
Change-Id: If117e5963df44fdc2f03e01716e8af16e2c91e58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453460Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814731}