【pir save 】Modiy export llama model file in pir mode

[xiaoguoguo626807]

PR types

Others

PR changes

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Description

pcard-67164 修改多处代码支持在pir模式下对llama-2-7b模型导出

1. 动转静下遇到动态shape 无法导出，需要将paddlenlp/transformers/llama/modeling.py 中关于attn_weights.shape 的判断代码在动转静下跳过。因为动态图运行此处可以拦截错误，动转静不会出现问题。
2. 当pad_token_id = None 时，PIR下不允许传递给full_like 的value 是none,此处逻辑不完备，generate 函数中会判断如果没有pad_token_id 时将pad_token_id 设置为eos_token_id
3. PIR下没有print op 且op相关的方法也不同。需要进行分支处理

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Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.62%. Comparing base (be5bb14) to head (e86f5bc). Report is 3 commits behind head on develop.

Files	Patch %	Lines
paddlenlp/generation/utils.py	50.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #8689 +/- ## ======================================== Coverage 55.61% 55.62% ======================================== Files 620 620 Lines 96965 96991 +26 ======================================== + Hits 53930 53949 +19 - Misses 43035 43042 +7 ```

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