[compiler-rt] [compiler-rt][tests] Make this test case pass on AArch64 (PR #117628)

[Paul Osmialowski via llvm-commits]

pawosm-arm wrote:

> Hmm. This doesn't seem to be a test for whether you can do an atomic load from constant memory, but just a test for atomic loads. I think we can remove the const and the test will make more sense.

Done.

https://github.com/llvm/llvm-project/pull/117628