[compiler-rt] [rtsan] Restrict arches and disable android (PR #98268)

[via llvm-commits]

dyung wrote:

> 1 Failure so far from the build bot. CC @davidtrevelyan , I'm disappearing for my trip very soon
> 
> > The Buildbot has detected a new failure on builder clang-aarch64-sve-vla while building compiler-rt.
> 
> ```
> 
> BUILD FAILED: failed stage 1 checked (failure)
> 
> Step 7 (ninja check 1) failure: stage 1 checked (failure)
> ******************** TEST 'RealtimeSanitizer-Unit :: ./Rtsan-aarch64-NoInstTest/failed_to_discover_tests_from_gtest' FAILED ********************
> 
> ********************
> ```

I'm trying to stabilize one of my bots (https://lab.llvm.org/buildbot/#/builders/174) and while testing the ToT offline, I am seeing this test fail as well on it. It was previously failing last night until the RTSAN feature was disabled. The failures since then are unrelated MemProfiler tests that are failing that I am trying to get fixed, but just wanted to give you a heads up that I am also seeing the failure on my bot.

https://github.com/llvm/llvm-project/pull/98268