lld :: ELF/invalid/symtab-sh-info.s is flaky on Windows

lld/test/ELF/invalid/symtab-sh-info.s (check-lld-elf) is recently flaky on Windows, e.g.

https://reviews.llvm.org/harbormaster/unit/view/192869/

http://45.33.8.238/win/27684/step_10.txt

It fails like every 3 or 4 builds. Could someone with a Windows machine check what is going on? Is that due to output non-determinism (just my guess) in yaml2obj.exe?

According to https://reviews.llvm.org/D88348#2344466, that diff should fix the failure.

I’ll commit it today.