PATCH: Document running V3 tests on installed compiler

[Mark Mitchell]

Joseph S. Myers wrote:

> Should this say to use runtest in an empty temporary directory because it 
> will create many temporary files and not necessarily remove all of them 
> afterwards?  (I don't know whether it is safe to share that directory 
> between simultaneous runs of the libstdc++, g++, gcc etc. testsuites.)

Revised thusly.  OK to apply?

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304
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