optimize the same weight judgement

[mengle-yang]

What is the purpose of the change

optimize the same weight judgement

Brief changelog

Move the logic to determine if the weights are the same before accumulation. So we can reduce addition operations

Verifying this change

Checklist

• [x] Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• [ ] Each commit in the pull request should have a meaningful subject line and body.
• [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• [ ] Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• [ ] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• [ ] Add some description to dubbo-website project if you are requesting to add a feature.
• [ ] GitHub Actions works fine on your own branch.
• [ ] If this contribution is large, please follow the Software Donation Guide.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.45%. Comparing base (afcf04d) to head (44d7627).

Additional details and impacted files

@@            Coverage Diff             @@
##              3.2   #13949      +/-   ##
==========================================
+ Coverage   70.43%   70.45%   +0.01%     
==========================================
  Files        1607     1607              
  Lines       70075    70075              
  Branches    10100    10100              
==========================================
+ Hits        49360    49373      +13     
+ Misses      16080    16071       -9     
+ Partials     4635     4631       -4     

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