[llvm] [LLVM] [X86] Fix integer overflows in frame layout for huge frames (PR #101840)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> and then during frame layout, when we adjust the offset to accommodate the frame layout and the frame pointer, we underflow `int32_t` and trigger the (corrected) offset assertion.
> 
> It looks like there's already code that tries to handle this kind of thing in X86 ISel here:

I'm wondering if we can just disable the assertion for 32-bit target. My intuition is the underflow doesn't matter to a 32-bit address. The value should be the same w/ or w/o `lea`.

https://github.com/llvm/llvm-project/pull/101840