[compiler-rt] fix window i386 regression (PR #73650)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

The change looks ok, but please improve the commit message (the PR description); at least reference the commit that caused the regression, and add tags to indicate the scope of the commit, e.g. “[asan]” at the start of the subject. And please spell out “windows”, not “window “. 

https://github.com/llvm/llvm-project/pull/73650