A construct like:
@_tls_array = alias i32, inttoptr (i32 44 to i32*)
(needed to link pretty much anything that was originally linked by vc++)
breaks on this change ⚙ D31364 LTO: Reduce memory consumption by creating an in-memory symbol table for InputFiles. NFCI.
if (!Base)
return make_error<StringError>("Unable to determine comdat of alias!",
inconvertibleErrorCode());
(Although the way I read the code, it has very little to do with comdat)