[Focal:*-5.15] UBUNTU: SAUCE: Work-around compile bug in gcc-9.4

[Stefan Bader]

It turned out that I messed up the test compile and my change does 
nothing to fix the problem. After a lot more digging I ended up reverting

minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()

which not only uses the macro stated but also converts the test into 
using statically_true() which seems to fail at least with the range 
check when using gcc-9. Just reverting the test used makes things even 
worse so I gave up and just reverted the whole thing. This seems at 
least successful for am64 (still want to do a full test build but wanted 
to give quick feedback on the list).

I am attaching the revert as it has to be context adjusted. Lots of code 
moved around.

-Stefan
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