[Mosaic] Fix infer/apply extensions. #25868
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1. For apply, llvm::StringMap()::insert(MapEntryTy*) will cause dangling reference if not constructing mlir::tpu::extensions::rules() with const-reference. However, if we do construct it with const-reference, the signature is not const-qualified and fails to compile. Hence, change it to llvm::StringMap()::insert(std::pair<...>) and get extension rules by const-reference. 2. Pass default tiling to infer rule, we need it to infer single op. See infer of tpu::MatmulOp. PiperOrigin-RevId: 715154257
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[Mosaic] Fix infer/apply extensions.