Reduce gc pressure on xorBytesCTR, #2877

[aankur]

Description

Reduce GC pressure on xorBytesCTR, by using sync.pool

Reference issue

Fixes #2877 (pion/webrtc#2877)

[Sean-Der]

Thank you @aankur!

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.70%. Comparing base (ac17807) to head (c8977fd).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
crypto.go	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #298      +/-   ##
==========================================
- Coverage   80.73%   80.70%   -0.04%     
==========================================
  Files          17       17              
  Lines        1163     1171       +8     
==========================================
+ Hits          939      945       +6     
- Misses        125      126       +1     
- Partials       99      100       +1     

Flag	Coverage Δ
go	80.70% <80.00%> (-0.04%)	⬇️
wasm	80.27% <80.00%> (-0.04%)	⬇️

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