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Document -ftree-fre's null effect?

From: Ben Elliston <bje at au1 dot ibm dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Tue, 05 Apr 2005 13:42:32 +1000
Subject: Document -ftree-fre's null effect?

I discovered that -ftree-fre is accepted by the compiler and is enabled at -O, but
the pass_fre pass structure is never scheduled to be run, so it has no effect.
Should this fact be documented?  I take it that we wish to keep FRE in the longer term?

Ben

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