[llvm] [MC][X86] Set SHF_X86_64_LARGE on mergeable constant sections for large code-model (PR #190903)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

if the small and large versions both have the proper relocations to them separately from small/large code model code, then I think this makes sense

although is this just a "it should be this way" or are you actually seeing relocation overflows to these? we should be using 64-bit sequences to access constant pools in the large code model right?

https://github.com/llvm/llvm-project/pull/190903