Improvements to 128-bit division performance

[mborland]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 84.57711% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.3%. Comparing base (b55cb22) to head (ac5c2ac).
⚠️ Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/decimal/detail/div_impl.hpp	79.8%	29 Missing ⚠️
include/boost/decimal/detail/u256.hpp	95.7%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1396     +/-   ##
=========================================
- Coverage     98.4%   98.3%   -0.1%     
=========================================
  Files          291     291             
  Lines        23530   23674    +144     
  Branches      2069    2070      +1     
=========================================
+ Hits         23152   23250     +98     
- Misses         378     424     +46     

Files with missing lines	Coverage Δ
include/boost/decimal/decimal128_t.hpp	95.7% <100.0%> (-<0.1%)	⬇️
include/boost/decimal/decimal_fast128_t.hpp	95.7% <100.0%> (-<0.1%)	⬇️
include/boost/decimal/decimal_fast64_t.hpp	97.6% <100.0%> (-<0.1%)	⬇️
include/boost/decimal/detail/u256.hpp	81.2% <95.7%> (-1.3%)	⬇️
include/boost/decimal/detail/div_impl.hpp	79.8% <79.8%> (-20.2%)	⬇️

... and 4 files with indirect coverage changes

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