Add p2p_comm_overlap for Llama-2-70b benchmark.

[Xreki]

PR types

Others

PR changes

Others

Description

Llama-2-70b模型benchmark开启p2p_comm_overlap优化。性能提升数据如下：

[paddle-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.32%. Comparing base (1ef7503) to head (8ce42d2).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8276   +/-   ##
========================================
  Coverage    55.32%   55.32%           
========================================
  Files          614      614           
  Lines        95333    95333           
========================================
  Hits         52747    52747           
  Misses       42586    42586           

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