[compiler-rt] [asan][test][MSVC] Disabling test on MSVC x86 because of optimized builds (PR #125871)

[Ben Langmuir via llvm-commits]

benlangmuir wrote:

@zacklj89 in case you missed it, the underlying change here made it into `release/20.x`, so you may want to cherry pick this fix like we did for the other test changes in https://github.com/llvm/llvm-project/pull/125583

https://github.com/llvm/llvm-project/pull/125871