[llvm] [SandboxIR] Added new StoreInst::create() functions with isVolatile arg (PR #100961)

[via llvm-commits]

vporpo wrote:

> so I'm implementing the setVerbose() method for the StoreInst or is it something completely separate?

Yes, both llvm::LoadInst and llvm::StoreInst have a `setVerbose(bool)` function, which is missing from both sandboxir::LoadInst and sandboxir::StoreInst.

https://github.com/llvm/llvm-project/pull/100961