Fix aten_pow when first input is a python constant

[xadupre]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.77%. Comparing base (92522eb) to head (1b859fe).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
onnxscript/function_libs/torch_lib/ops/core.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2048      +/-   ##
==========================================
- Coverage   73.77%   73.77%   -0.01%     
==========================================
  Files         225      225              
  Lines       29330    29333       +3     
  Branches     3467     3467              
==========================================
+ Hits        21638    21639       +1     
- Misses       6559     6560       +1     
- Partials     1133     1134       +1     

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