[asan] split asan_test.cc even more

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173131 91177308-0d34-0410-b5e6-96231b3b80d8
ASan: disable flexible mapping and offset on Android. It doesn't work for dynamic ASan runtime there

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173132 91177308-0d34-0410-b5e6-96231b3b80d8
ASan: simplify build rules for unit tests

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173133 91177308-0d34-0410-b5e6-96231b3b80d8