[llvm] [AMDGPU][SplitModule] Do not create empty modules (PR #135761)

[Matt Arsenault via llvm-commits]

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@@ -1500,10 +1511,12 @@ static void splitAMDGPUModule(
             return false;
           }
 
-          // Everything else goes in the first partition.
-          return needsConservativeImport(GV) || PID == 0;
+          // Everything else goes in the first non-empty module we create.
+          return needsConservativeImport(GV) || ImportAllGVs;
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arsenm wrote:

Swap conditions for the trivial condition first 

https://github.com/llvm/llvm-project/pull/135761