[PATCH] c++/66561 - __builtin_LINE at al. should yield constant expressions

[Martin Sebor]

PR c++/66639 asked to declare __func__ , __FUNCTION__ and
__PRETTY_FUNCTION__ as constexpr​.  With the request fulfilled
sometime in the 6.0 time frame (possibly as a result of fixing
c++/70353), the attached patch implements the corresponding
change suggested in c++/66561 - __builtin_LINE at al. should
yield constant expression, and updates the manual to reflect
both.  It has been tested on x86_64 Linux.

Martin
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