[llvm-branch-commits] [Github][CI] Make premerge upload results on Linux and Windows (PR #170414)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/170414

Now that the issue-write workflow can support writing comments from
multiple files, make the premerge workflow write out comments from both
x86_64 Linux and Windows. AArch64 Linux right now is left out as the
premerge advisor does not currently support it.