Checked that on x86_64-pc-windows-msvc target,
found duplicates in versions:

rustc 1.56.0-beta.1 (e784c962e 2021-09-07)
rustc 1.57.0-nightly (b69fe5726 2021-09-10)

and no duplicates 2 duplicates (only rust-lld.exe, ld.exe) in stable rustc 1.55.0 (c8dfcfe04 2021-09-06), rustc 1.56.0-nightly (4e282795d 2021-07-31)
(bisecting is kinda slow on my connection)

there 3 copies of that executable, that gives ~ 187mb

@rustbot label +regression-from-stable-to-beta