T gamma bama jama

[ckormanyos]

Finally PR-ing tgamma() at $128$ bits. With one test and a few TODOs. But let's see how CI cycles...

This PR is also interested in the bug fix for #520

[ckormanyos]

Hi Matt (@mborland) tgamma() at 128 bit is looking good. I added a few more tests and its cycling now. If I end up merging this, then we need to replace my homegrown impls of fma() with the real one as soon as #520 gets fixed as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.7%. Comparing base (b2798ed) to head (c2b3312).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #521     +/-   ##
=========================================
- Coverage     98.7%   98.7%   -0.0%     
=========================================
  Files          181     181             
  Lines        11476   11507     +31     
=========================================
+ Hits         11326   11352     +26     
- Misses         150     155      +5     

Files	Coverage Δ
...de/boost/decimal/detail/cmath/impl/lgamma_impl.hpp	75.0% <ø> (ø)
...decimal/detail/cmath/impl/taylor_series_result.hpp	100.0% <100.0%> (ø)
...de/boost/decimal/detail/cmath/impl/tgamma_impl.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/tgamma.hpp	100.0% <100.0%> (ø)
test/test_tgamma.cpp	99.2% <100.0%> (+0.2%)	⬆️

... and 3 files with indirect coverage changes

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[ckormanyos]

Hi Matt (@mborland) I'm going to go ahead and merge this one to get the ball rolling again. There are some local impls of fma() that I'll remove when develop has the 128-bit fma() fix.