[compiler-rt] [compiler-rt][Mips] Properly guard references to _ABIN32 (PR #124492)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

### Merge activity

* **Jan 27, 4:49 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/124492).


https://github.com/llvm/llvm-project/pull/124492