[llvm] [RISCV][GlobalISel] Select G_GLOBAL_VALUE (PR #68380)

[Nitin John Raj via llvm-commits]

nitinjohnraj wrote:

Currently, this patch does not compile. I'm trying to figure out which file to import in order to use the new generic instruction opcodes in the instruction selector. Also, I'm only trying to handle the medlow code model for now. I intend to add code for medany as well.

https://github.com/llvm/llvm-project/pull/68380