[llvm] [Offload] Add olKernelMaxGroupSize (PR #142950)

[Ross Brunton via llvm-commits]

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@@ -570,6 +570,14 @@ struct AMDGPUKernelTy : public GenericKernelTy {
                    KernelLaunchParamsTy LaunchParams,
                    AsyncInfoWrapperTy &AsyncInfoWrapper) const override;
 
+  /// Return maximum block size for maximum occupancy
+  ///
+  /// TODO: This needs to be implemented for amdgpu
+  Expected<size_t> maxGroupSize(GenericDeviceTy &GenericDevice,
+                                size_t DynamicMemSize) const override {
+    return 1;
+  }
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RossBrunton wrote:

I had a look and found https://github.com/ROCm/hip/blob/854768787ee9bbd6ed22b3e8fd0f139955a57e6a/src/hip_module.cpp#L1015 (which might be a bit out of date). I took one look at it and decided it was probably worth doing as a separate change.

https://github.com/llvm/llvm-project/pull/142950