discover VK_KHR_zero_initialize_workgroup_memory

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.43%. Comparing base (40f7b4e) to head (9f7895b).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gpu.cpp	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5947       +/-   ##
===========================================
+ Coverage   95.14%   95.43%    +0.28%     
===========================================
  Files         403      819      +416     
  Lines      110891   268148   +157257     
===========================================
+ Hits       105506   255898   +150392     
- Misses       5385    12250     +6865     

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