This patch serves two main purposes:
Firstly, to split some of the logic into a seperate method
to try and improve readability
On top of this, it aims to make creating the reductions more generic.
That way, subsequent patches adding reductions shouldn't need
to add a significant amount of extra logic checks, such as checking
for specific operators.
Reviewed By: awarzynski
Differential Revision: https://reviews.llvm.org/D131161
5784199dd1