This package, named emacs-nativecomp, conflicts with the stock emacs that you should remove before
installing this one and vice versa.

It ships emacs with native compilation. Quote of:
https://www.gnu.org/software/emacs/manual/html_node/elisp/Native-Compilation.html

"In addition to the byte-compilation, described in the previous chapter, Emacs can also optionally
compile Lisp function definitions into a true compiled code, known as native code. This feature
uses the libgccjit library, which is part of the GCC distribution, and requires that Emacs be built
with support for using that library."