Convert bionic benchmarks and tests to Android.bp

The compile-time tests and a few custom libraries for dynamic linker
testing are still compiled in make.

Also converts the make rules to run tests on the host to shell scripts
in tests/run-on-host.sh and benchmarks/run-on-host.sh

Change-Id: I6f174b3a69d58c4ed74d29f4e79332d483681534