compiler: Ignore argument when typechecking converted recover calls.
compiler: Ignore argument when typechecking converted recover calls.

Fixes gcc.gnu.org/PR61248.

LGTM=iant
R=iant
CC=gofrontend-dev
https://golang.org/cl/191790044

qskycolor/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,anlhord/gofrontend,golang/gofrontend,golang/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,golang/gofrontend,golang/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,anlhord/gofrontend