[asan] Detect asanwrapper binary in android tests.
[asan] Detect asanwrapper binary in android tests.

Tests need to be run either via asanwrapper or asanwrapper64
depending in the binary bitness. This matters when testing on an
aarch64 device.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@246891 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt