[llvm] [llvm/mc] Add support for sdata8 for FDE CIE (PR #174508)

[Farid Zakaria via llvm-commits]

fzakaria wrote:

What do we think about this? O.o

I'm also looking at dynamically resizing the FDE & LSDA if they overflow in same vein as https://github.com/llvm/llvm-project/pull/179089
This would be necessary to handle any mcmodel=small that we could not recompile.

That would technically make this change unecessary, but not having to do that work in the linker if it's already sdata8 seems also a great addition.

https://github.com/llvm/llvm-project/pull/174508