Align CPUHashMap and CUDAHashMap implementations

[rusty1s]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.62500% with 6 lines in your changes missing coverage. Please review.

Project coverage is 86.85%. Comparing base (ef72b03) to head (0d5da7c).

Files with missing lines	Patch %	Lines
pyg_lib/csrc/classes/cpu/hash_map.cpp	90.62%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
- Coverage   87.17%   86.85%   -0.32%     
==========================================
  Files          38       36       -2     
  Lines        1193     1210      +17     
==========================================
+ Hits         1040     1051      +11     
- Misses        153      159       +6     

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