[clang] [llvm] [LLVM][Triple][NFCI] Add function to test for offloading triples (PR #126956)

[Joseph Huber via cfe-commits]

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@@ -1109,6 +1109,11 @@ class Triple {
            Env == llvm::Triple::EABIHF;
   }
 
+  /// Tests if the target represents a device which can be offloaded to.
+  bool isOffloadingTarget() const {
+    return isAMDGPU() || isNVPTX() || isSPIRV();
+  }
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jhuber6 wrote:

I don't think this belongs in regular triple handling. It could be a more generic 'isTargetGPU` but I think there were some objections given that SPIR-V can target other things?

My concern is that this is a `triple` which just handles a single target, while the concept of 'offloading' is only relevant with an auxiliary triple. I think this is better as a helper in Clang, we could possible even combine all of these `isCUDADevice`, `isOpenMPDevice` checks as well.

https://github.com/llvm/llvm-project/pull/126956