Add missing denorm_min numeric trait

[dalg24]

Partial fix for #4442

[dalg24]

I am puzzled by the CUDA 11.0.211 build issue (error: identifier "FLT_TRUE_MIN" is undefined)
I can't reproduce on the compiler explorer https://godbolt.org/z/MP6h4Y46v. I also pulled the nvidia/cuda:11.0-devel container and it does compile when I pass the -std=c++17 flag

[dalg24]

https://godbolt.org/z/qv13E6xKj

Turns out it was a GCC version issue.

I found the *_TRUE_MIN macros are undefined for GCC until 9.2, for Clang until 9 (interestingly for Clang it works when dropping the -std=c++17 flag), for all versions of Intel. Fun stuff...