[llvm] Fix stack layout for frames larger than 2gb (PR #84114)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> @phoebewang any preference to how we fix this?

Do you mean https://github.com/llvm/llvm-project/issues/87154? I took a quick look at it. The problem happens in fastISel only. It looks to me DAGISel can select to `lea` or `mov` with different offset. I didn't look deep into it, but guess we may learn how DAGISel handle it or bail out to DAGISel otherwise?

https://github.com/llvm/llvm-project/pull/84114