[clang] [clang][AMDGPU] Evaluate deferred constant printf formats (PR #231967)

[Steffen Larsen via cfe-commits]

steffenlarsen wrote:

> Forcing emission of the global out-of-order seems likely to lead to complications. I'd rather not do that unless we really have to.
> 
> Can you use evaluateValue to evaluate the value of constant global arrays?

Good shout! Also makes for a much cleaner patch.

https://github.com/llvm/llvm-project/pull/231967