[Feature] Allow register multi-name for a module simultaneously

[nbei]

No description provided.

[hellock]

Unit tests failed.

[codecov]

Codecov Report

Merging #775 (dc211c0) into master (643009e) will increase coverage by 0.58%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #775      +/-   ##
==========================================
+ Coverage   62.65%   63.23%   +0.58%     
==========================================
  Files         139      143       +4     
  Lines        8271     8403     +132     
  Branches     1486     1504      +18     
==========================================
+ Hits         5182     5314     +132     
  Misses       2820     2820              
  Partials      269      269              

Flag	Coverage Δ
unittests	63.23% <100.00%> (+0.58%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmcv/utils/registry.py	97.36% <100.00%> (+0.14%)	⬆️
mmcv/tensorrt/init_plugins.py	0.00% <0.00%> (ø)
mmcv/tensorrt/__init__.py	0.00% <0.00%> (ø)
mmcv/onnx/info.py	12.50% <0.00%> (ø)
mmcv/tensorrt/tensorrt_utils.py	0.00% <0.00%> (ø)
mmcv/ops/roi_align.py	60.00% <0.00%> (+5.34%)	⬆️
mmcv/onnx/simplify/common.py	13.79% <0.00%> (+13.79%)	⬆️
mmcv/onnx/simplify/core.py	14.04% <0.00%> (+14.04%)	⬆️
mmcv/onnx/onnx_utils/symbolic_helper.py	19.87% <0.00%> (+19.87%)	⬆️
mmcv/onnx/symbolic.py	25.38% <0.00%> (+25.38%)	⬆️
... and 2 more

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