[llvm] [Offload] Use llvm::Error throughout liboffload internals (PR #140879)

[Callum Fare via llvm-commits]

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@@ -61,7 +61,7 @@ void EmitOffloadImplFuncDecls(const RecordKeeper &Records, raw_ostream &OS) {
   OS << GenericHeader;
   for (auto *R : Records.getAllDerivedDefinitions("Function")) {
     FunctionRec F{R};
-    OS << formatv("{0}_impl_result_t {1}_impl(", PrefixLower, F.getName());
+    OS << formatv("llvm::Error {0}_impl(", F.getName());
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callumfare wrote:

These declarations are used in the `llvm::offload` namespace, so you could just use `Error` here

https://github.com/llvm/llvm-project/pull/140879