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This is a reland of 27453d76

Split out the is_a_target_toolchain change to another change.

Original change's description:
> Add a flag for building HWASAN splits.
>
> The new build_hwasan_splits flag causes HWASAN splits to be created for
> the Monochrome6432 and TrichromeChrome6432 bundles, as well as any of its
> DFMs that contain native code. The intent is that this flag will eventually
> default to true in official builds.
>
> The library is deliberately installed in TrichromeChrome6432 rather than
> TrichromeLibrary6432 (where the regular native library lives) because the
> Android platform does not support splits for the library containing the
> WebView implementation. This means that only Chrome will use the HWASANified
> native library, and WebView will use the regular native library.
>
> Bug: 916828
> Change-Id: Ie92bb36e83df245ab431b0123a44b0f0a3182100
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769731
> Commit-Queue: Peter Collingbourne <pcc@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#729945}

Bug: 916828
Change-Id: I2c64720b72572a1c718cbd44d79d3fb2a44afcac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994671Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732689}