[xla:gpu] Remove GatherSimplifier and ScatterSimplifier from `run…

…SPMDPasses`, to avoid breaking the parallel dimensions pattern for propagation and partitioning in GSPMD.

Those passes are applied in `RunOptimizationPasses` which is after partitioning.

PiperOrigin-RevId: 625246878

xla/service/gpu/gpu_compiler.cc

@@ -651,10 +651,8 @@ absl::Status RunSPMDPasses(
 
     spmd_simplify.AddPass<SortSimplifier>();
     spmd_simplify.AddPass<TupleSimplifier>();
-    spmd_simplify.AddPass<ScatterSimplifier>();
     spmd_simplify.AddPass<ScatterExpander>(
         ScatterExpander::kEliminateSimpleScatters);
-    spmd_simplify.AddPass<GatherSimplifier>();
     spmd_simplify.AddPass<GatherExpander>(
         GatherExpander::kEliminateSimpleGathers);
     spmd_simplify.AddPass<WhileLoopConstantSinking>();