Add ASAN prebuilt generation
am: 6adbc36d2f

Change-Id: I7e2a1143e89198cb5332f774c875f4299c16c1ae
tree: 4c6deb7f44a09799a324ba30136f1d620ec9b4bf
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml