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pthread_getattr_np implementation in bionic throws sigabrt on failure to
read proc/ file. Implement this function to avoid crashes.

BUG=1129941

Change-Id: I54b94a609201a998924aaa8c8e77051f85acf377
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425744
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810829}