[patch] fix PR c++/14136: Duplicate error message

[Nathan Sidwell]

Volker Reichelt wrote:

> The following patch fixes that by not issuing the error message when we
> do tentative parsing only.
> 
> Bootstrapped and regtested on i686-pc-linux-gnu.
> Ok for mainline?
yes thanks.  I don't know how to count error occurances either.

nathan


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