[llvm] [AMDGPU][llvm-split] Fix division by zero (PR #98888)

[Pierre van Houtryve via llvm-commits]

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@@ -256,11 +256,12 @@ calculateFunctionCosts(SplitModuleLogger &SML, GetTTIFn GetTTI, Module &M,
   }
 
   CostType FnCost = (ModuleCost - KernelCost);
+  CostType ModuleCostOr1 = ModuleCost ? ModuleCost : 1;
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Pierre-vh wrote:

Detecting this earlier than just early-retun the pass would be better but this works as a temporary fix.
The pass is going to be rewritten very soon anyway, I'll make sure this is handled in the rewrite.

https://github.com/llvm/llvm-project/pull/98888