move handling of pr21419 in the front-ends, fix pr21451

[Nathan Sidwell]

Paolo Bonzini wrote:
-----------------------------------------
> 
> 2005-10-02  Paolo Bonzini  <bonzini@gnu.org>
> 
> 	* c-typeck.c (readonly_error): Handle USE being lv_asm.
> 	(build_asm_expr): Call it if outputs are read-only.
> 	* gimplify.c (gimplify_asm_expr): Remove former fix to PR 21419.
> 
> 2005-10-02  Paolo Bonzini  <bonzini@gnu.org>
> 
> 	* semantics.c (finish_asm_stmt): Call readonly_error if outputs are
> 	read-only.
> 
> 2005-10-02  Paolo Bonzini  <bonzini@gnu.org>
> 
> 	* gcc.dg/asm-1.c: Compile on all targets.
> 	* gcc.dg/pr21419.c: Adjust error messages.
> 	* g++.dg/ext/asm7.C: New.

the c++ bits are ok too.

nathan

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