[Bug jit/105829] Allow getting the size of floating-point types

[bouanto at zoho dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105829

--- Comment #1 from Antoni <bouanto at zoho dot com> ---
Created attachment 53075
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53075&action=edit
First patch