My benchmark which spend most time preparing function parameters takes `250 ms` now, from `510 ms` before. This is mainly achieved by doing less unnecessary work and by giving the compiler more inlined code to optimize. * Reserve correct vector sizes and use unchecked `append` function. * Construct `GVArray` parameters directly in the vector, instead of moving/copying them in the vector afterwards. * Inline some constructors, because that allows the compiler understand what is happening, resulting in less code. This probably has negilible impact on the user experience currently, because there are other bottlenecks. Differential Revision: https://developer.blender.org/D15009