[Bug c++/108138] g++ 9+ takes 7-10x longer compiling constexpr

[peter at meraki dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108138

--- Comment #1 from Peter Hurley <peter at meraki dot com> ---
Created attachment 54108
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54108&action=edit
testcase header file