runtime: no need to convert 'c.fault()' to uintptr in sighandler
After CL 528817, *sigctxt.fault of all arches return uintptr, so
there is no need to convert 'c.fault()' to uintptr anymore.
Change-Id: I062283b578adaaee69d8f439b109a573eeb15110
GitHub-Last-Rev:
3ce3a75a66557d1a8ff089fd532ac694bfa0104f
GitHub-Pull-Request: golang/go#63133
Reviewed-on: https://go-review.googlesource.com/c/go/+/529995
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>