buffer: add early return for zero-length concat calls

[gurgunday]

This PR adds an early return for when the passed list to concat has buffers with length 0, it increases the speed of this specific case significantly while not having a significant effect on other cases, the check is done once

Before

buffers/buffer-concat.js
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=0 pieces=4: 21,154,950.27952036
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=0 pieces=4: 19,196,794.135379393
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=4: 6,989,916.337953473
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=4: 6,865,887.074369392
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=4: 6,721,592.326401666
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=4: 6,556,017.96516101
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=4: 4,483,340.537034144
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=4: 4,402,483.275722712
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=0 pieces=16: 11,026,637.420164905
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=0 pieces=16: 11,842,107.639370283
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=16: 2,236,282.0692457757
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=16: 2,303,720.328352138
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=16: 2,131,347.3893047236
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=16: 2,188,456.664168826
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=16: 990,001.0414563456
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=16: 1,006,497.9406397911

After

buffers/buffer-concat.js
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=0 pieces=4: 29,413,341.347488407 +
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=0 pieces=4: 29,923,787.106618155 +
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=4: 6,840,184.125444326
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=4: 6,860,703.071986998
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=4: 6,595,750.911730649
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=4: 6,687,702.724123686
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=4: 4,516,053.166206851
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=4: 4,397,381.275899957
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=0 pieces=16: 22,975,191.35965086 +
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=0 pieces=16: 29,982,993.646003988 +
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=16: 2,235,451.225159163
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=16: 2,262,244.3089532913
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=16: 2,131,322.3142175823
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=16: 2,163,427.3286168366
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=16: 995,333.8537428093
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=16: 991,416.6050230672

[nodejs-github-bot]

Review requested:

• @nodejs/performance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.56%. Comparing base (2bda7cb) to head (9c655ac).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60393      +/-   ##
==========================================
- Coverage   88.56%   88.56%   -0.01%     
==========================================
  Files         704      704              
  Lines      207774   207777       +3     
  Branches    40025    40033       +8     
==========================================
- Hits       184022   184018       -4     
- Misses      15807    15811       +4     
- Partials     7945     7948       +3     

Files with missing lines	Coverage Δ
lib/buffer.js	99.12% <100.00%> (-0.88%)	⬇️

... and 36 files with indirect coverage changes

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[gurgunday]

Oops, this breaks

Let me try something simpler