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Various GN conditions check target_cpu when deciding which compiler
flags to apply; they should be checking current_cpu instead so that
builds with more than one toolchain use the correct flags for each
toolchain. This was causing the DWARF version workaround for
crbug.com/744956 to not be applied on the 64-bit build when using the
32-bit toolchain.

Bug: 744956, 889937
Change-Id: Id2f4ecafd762e36ed3593fb45f6a6062bf8f6326
Reviewed-on: https://chromium-review.googlesource.com/1249393Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594791}