Don't call into LLVM's fmin/fmax on <sm_80.

[maleadt]

Fixes #2148

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (301318e) 72.17% compared to head (cee7722) 72.18%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2154      +/-   ##
==========================================
+ Coverage   72.17%   72.18%   +0.01%     
==========================================
  Files         159      159              
  Lines       14485    14487       +2     
==========================================
+ Hits        10455    10458       +3     
+ Misses       4030     4029       -1     

Files	Coverage Δ
src/compiler/compilation.jl	95.53% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes

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