[llvm] [Cygwin] Cygwin X86ISelDAGToDAG.cpp (PR #76284)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> > is the configure check is using the medium code model on cygwin? how large is the linked binary in the failing configure check? is it running into relocation overflows?
> > providing the configure source file being compiled would be helpful
> 
> Yes, Cygwin 64 bit must use medium code model. Otherwise, there are runtime errors.

In which case we shouldn't be allowing the other code models to be enabled in the first place for cygwin64 triples, not trying to fixup later on - I'm pretty sure we already do this restriction in other cases.

https://github.com/llvm/llvm-project/pull/76284