Unlike function calls, when processing instructions that directly
fault we must not subtract 1 from the pc before looking up the
file/line information.

Since the file/line lookup unconditionally subtracts 1, add 1 to
the faulting instruction PCs to compensate.

Fixes #34123

Change-Id: Ie7361e3d2f84a0d4f48d97e5a9e74f6291ba7a8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/196962
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>