avoid measuring allocation in jiter iter benches

[davidhewitt]

No description provided.

[codecov]

Codecov Report

Merging #46 (bc61a6f) into main (f6739a8) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files           8        8           
  Lines        1045     1045           
=======================================
  Hits          936      936           
  Misses        109      109           

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[codspeed-hq]

CodSpeed Performance Report

Merging #46 will improve performances by 57.41%

_{Comparing dh/bench-vec (bc61a6f) with main (f6739a8)}

Summary

⚡ 4 improvements
✅ 33 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	dh/bench-vec	Change
⚡	massive_ints_array_jiter_iter	5.2 ms	4.4 ms	+17.08%
⚡	string_array_jiter_iter	63.5 µs	48.2 µs	+31.74%
⚡	true_array_jiter_iter	38.1 µs	28.4 µs	+34.44%
⚡	true_object_jiter_iter	194.5 µs	123.6 µs	+57.41%

[samuelcolvin]

LGTM