Fix assertion failure in Qwen 1.5 with prefix caching enabled #3373
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Fix #3355.
Prefix caching is currently not supported with sliding window attention, and model runner asserts
model_config.get_sliding_window()is None.However, Qwen2/Qwen1.5 use
use_sliding_windowto turn off sliding window, which disables sliding window by default butmodel_config.get_sliding_window()is not None.