Vector math library codegen in Debug

This will be about how when in your C++ code you have a “vector math library”, and how the choices of code style in there affect non-optimized build performance.
Backstory A month ago I got into the rabbit hole of trying to “sanitize” the various ways that images can be resized within Blender codebase. There were at least 4 different functions to do that, with different filtering modes (expected), but also different corner case behaviors and other funkiness, that was not well documented and not well understood.