[llvm] [JITLink][i386] Avoid 'i386' name clashing with built-in macro (PR #137063)

[Dimitry Andric via llvm-commits]

DimitryAndric wrote:

Since the llvm build system itself explicitly compiles this with `-std=c++17`, _not_ `-std=gnu++17`, I think the problem we've encountered in FreeBSD is self-inflicted. :)  Then again, for other projects it might be nicer to avoid this identifier, or at the least `#undef` it if it exists.


https://github.com/llvm/llvm-project/pull/137063