[patch] explain possible conflicts with -dCHARS and cpp

[Eric Christopher]

>> If you use @option{-dM} without the @option{-E} option, @option{- 
>> dM} is
>> interpreted as a synonym for @option{-fdump-rtl-mach}.  @xref (or  
>> one of
>> the other cross-referencing nodes){the node for -fdump-rtl-mach}.

Once more into the breach...

Here's another run at it. I pretty much used the wording above, but  
you can't
xref something in another document afaik so we can't xref it to the  
gcc manual.
I could put another note to look over there for more information if  
you'd like.

Otherwise, tested by building and examining the docs on x86-darwin.

OK?

-eric

2007-07-03  Eric Christopher  <echristo@apple.com>

	* doc/cppopts.texi: Add conflicting option note to -dM.
	* doc/invoke.texi: Add note about possible conflicts with
	-E for -dCHARS and note that -dM will not produce
	any results if there is no machine dependent reorg.

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