[clang] [Clang] Lift HIPSPV onto the new offload driver (PR #168043)

[Pekka Jääskeläinen via cfe-commits]

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@@ -6990,6 +6990,12 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
         break;
       case llvm::Triple::spirv32:
       case llvm::Triple::spirv64:
+        if (Target.getOSName() == "hipspv" ||
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pjaaskel wrote:

@linehill can we just add a chipstar OS enum? I think it's a better name also than 'hipspv' now.

https://github.com/llvm/llvm-project/pull/168043