[llvm] [Offload] Add `MAX_WORK_GROUP_SIZE` device info query (PR #143718)

[Callum Fare via llvm-commits]

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@@ -261,12 +297,21 @@ Error olGetDeviceInfoImplDetail(ol_device_handle_t Device,
     return Device == HostDevice() ? ReturnValue(OL_DEVICE_TYPE_HOST)
                                   : ReturnValue(OL_DEVICE_TYPE_GPU);
   case OL_DEVICE_INFO_NAME:
-    return ReturnValue(GetInfo({"Device Name"}).c_str());
+    if (Device == HostDevice())
+      return ReturnValue("Host");
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callumfare wrote:

I wonder if we should do something to avoid having to special-case the host device everywhere in this function. Maybe a separate function that we delegate to when `Device == HostDevice()`. It could return an `UNSUPPORTED_ENUM` error for most properties since I don't think we really want to implement all of them.

https://github.com/llvm/llvm-project/pull/143718