Fix GCC-13 perf regression

[chfast]

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.94%. Comparing base (48870fa) to head (c729a80).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files          10       10           
  Lines        1829     1831    +2     
=======================================
+ Hits         1828     1830    +2     
  Misses          1        1           

Flag	Coverage Δ
32bit	99.94% <100.00%> (+<0.01%)	:arrow_up:
gcc	99.39% <100.00%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
include/intx/intx.hpp	99.85% <100.00%> (+<0.01%)	:arrow_up: