[patch] Fix PR c++/23089, ICE on incomplete function parameter

[Mark Mitchell]

Volker Reichelt wrote:
> Consider the following C++ testcase:
> 
>   void foo(struct A) {}
> 
> When compiling this with -O we get an ICE after a sensible error message:
> 
>   PR23089.cc: In function 'void foo(A)':
>   PR23089.cc:1: error: '<anonymous>' has incomplete type
>   PR23089.cc:1: error: forward declaration of 'struct A'
>   PR23089.cc:1: internal compiler error: in int_mode_for_mode, at stor-layout.c:248
> 
> The following patch fixes the ICE by marking the function parameter as
> invalid after it has been diagnosed as incomplete. (We already did this
> for a void parameter.)
> 
> Bootstrapped and regtested on i686-pc-linux-gnu.
> Ok for mainline and 4.0 branch (since it's a regression)?

OK.

-- 
Mark Mitchell
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