gopprof: regexp fixes
gopprof: regexp fixes

Extract Windows filenames correctly.
Don't remove receivers from method names.

Fixes issue 2227.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4969059

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go