Direct calls whose callback arguments resolve to known functions call a
copy of the helper made for that tuple of targets, so the constant-callback
analysis devirtualizes and LLVM inlines the callback. Constant callbacks
also resolve through recursion that forwards the callback, through other
consumers' parameters, and through unwritten captures.
Copies are limited to bodies of at most 300 IR nodes and 4 copies per
function, which keeps the self-hosted compiler within 1% of its size.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
