[llvm] [formatv][FmtAlign] Use fill count of type size_t instead of uint32_t (PR #78459)

[Andrei Golubev via llvm-commits]

andrey-golubev wrote:

> For the record, can you please post the compiler message that you see before this PR? (As well as compiler version)

aha. this would be rather complicated since I'm not the original author (also, this patch was submitted ~1 year ago). to the best of my knowledge, it fails on some MSVC version on x86. i can try to ping whoever brought it up in our downstream originally, maybe they still have something of the kind around.

https://github.com/llvm/llvm-project/pull/78459