Do not bundle compiler-rt libraries (ASan,UBSan,Profile) for Android on i686.

This change removes 6+ MB of binaries from the build tools bundle:
3.7M	lib/linux/libclang_rt.asan-i686-android.so
2.5M	lib/linux/libclang_rt.ubsan_standalone-i686-android.so
80K	lib/linux/libclang_rt.profile-i686-android.a

It also can break some workflows, but as discussed in person, there is a good
chance that no one is using those libraries on i686 arch.


Bug: 866225
Change-Id: Ifbc85e542359681f60f19f52e5bd7a8a7e1655f3
Reviewed-on: https://chromium-review.googlesource.com/1158708Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579854}

tools/clang/scripts/update.py

@@ -828,9 +828,11 @@ def UpdateClang(args):
       RunCommand(['ninja', 'asan', 'ubsan', 'profile'])
 
       # And copy them into the main build tree.
+      want_archs = '{aarch64,arm}'
       want = [
-          'lib/linux/*.so',  # ASan and UBSan shared libraries only.
-          'lib/linux/*profile*',  # Static profile libraries.
+          'lib/linux/libclang_rt.asan-%s-android.so' % want_archs,
+          'lib/linux/libclang_rt.ubsan_standalone-%s-android.so' % want_archs,
+          'lib/linux/libclang_rt.profile-%s-android.a' % want_archs,
       ]
       for p in want:
         for f in glob.glob(os.path.join(build_dir, p)):