[clang] [llvm] [CUDA] Add a pseudo GPU sm_next which allows overriding for SM/PTX version. (PR #100247)

[Artem Belevich via cfe-commits]

================
@@ -96,6 +96,7 @@ static const OffloadArchToStringMap arch_names[] = {
     SM(89),                          // Ada Lovelace
     SM(90),                          // Hopper
     SM(90a),                         // Hopper
+    SM(next),                        // Placeholder for a new arch.
----------------
Artem-B wrote:

The position of the entry in the table does not matter. Each entry will contain 
appropriate `OffloadArch::SM_##sm` enum. `SM(next)` will carry its own 
`OffloadArch::SM_next`. and it will remain so even when a new GPU gets added. 
The new GPU will get its own enum.

https://github.com/llvm/llvm-project/pull/100247
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