[PATCH] [sanitizer] Android build cleanup.

[Evgeniy Stepanov]

Hi samsonov,

- Detect Android toolchain target arch and set runtime library name appropriately.
- Merged a lot of Android and non-Android code paths.
- Android is only supported in standalone build of compiler-rt now.
- Linking lsan-common in ASan-Android (makes lsan annotations work).
- Relying on -fsanitize=address linker flag when building tests (again, unification with non-Android path).
- Runtime library moved from lib/asan to lib/linux for some reason. It's probably better this way.

Btw, why separate compiler setting for tests? Will it go away when we switch to standalone build?

http://reviews.llvm.org/D5467

Files:
  CMakeLists.txt
  cmake/Modules/AddCompilerRT.cmake
  cmake/config-ix.cmake
  lib/asan/CMakeLists.txt
  lib/asan/scripts/asan_device_setup
  lib/asan/tests/CMakeLists.txt
  lib/interception/CMakeLists.txt
  lib/lsan/CMakeLists.txt
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/tests/CMakeLists.txt
  test/asan/CMakeLists.txt
  test/asan/lit.cfg
  test/asan/lit.site.cfg.in
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