The expression passed into isAbortPC call was written specifically
for windows/amd64 and windows/386 runtime.abort implementation.
Adjust the code, so it also works for windows/arm.

Fixes #29050

Change-Id: I3dc8ddd08031f34115396429eff512827264826f
Reviewed-on: https://go-review.googlesource.com/c/152357Reviewed-by: Ian Lance Taylor <iant@golang.org>