Suffix l missing in C++ standard header <numbers>

[Helmut Burkhardt via cfe-commits]

Dear llvm front end team

The clang precision of <long double> mathematical constants is the same as for <double>

Please add the suffix l. Example :
template <floating_point _Tp> inline constexpr _Tp e_v<_Tp>          = 2.718281828459045235360287471352662;
—>
template <floating_point _Tp> inline constexpr _Tp e_v<_Tp>          = 2.718281828459045235360287471352662l;
and the following lines

to actually provide long double precision.

Kind regards
   Helmut Burkhardt

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