refactor(3p/nix/libexpr): Use range insertion to merge nix::Bindings r/1320

Instead of manually iterating over the two bindings to be combined,
this adds a new static method on the Bindings class which merges two
attribute sets by calling the range insertion operator over them.

In some anecdotal tests, this can lead to a ~10% speed bump -
depending on the specific operation.

Change-Id: I5dea03b0589a83a789d3a8a0fc81d0d9e6598371
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1216
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>

0 files changed, 0 insertions, 0 deletions