code review 4274063: testing: compile regexp only once

testing: compile regexp only once
The -test.run and -test.bench flags were compilng the regexp for ever test
function, which was mucking up memory profiles.   Add a simple wrapper
to save the compiled state so that the regexp is compiled only once for
each flag.

[r, 2011-03-16 17:28:54]

Hello rsc (cc: golang-dev@googlegroups.com),

I'd like you to review this change to
https://go.googlecode.com/hg/

[rsc, 2011-03-16 17:30:38]

LGTM

[r, 2011-03-16 17:32:24]

*** Submitted as http://code.google.com/p/go/source/detail?r=786104c3c59b ***

testing: compile regexp only once
The -test.run and -test.bench flags were compilng the regexp for ever test
function, which was mucking up memory profiles.   Add a simple wrapper
to save the compiled state so that the regexp is compiled only once for
each flag.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4274063