[libc-commits] [libc] [libc] Use generic/builtin.h for Emscripten in memory utils (PR #177474)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM as long as you've confirmed that the builtins don't call the library functions (as jhuber suggested)

https://github.com/llvm/llvm-project/pull/177474