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Re: Fix PR middle-end/17703, c++/17657, c++/17554

I was asked by Zack to combine both of these patches and post them again
as they are related and interfere with each other.
I also tried fixed some of the comments which Zack pointed to have some
grammar problems.


OK? Bootstrapped and tested on powerpc-darwin.


ChangeLog:

	* fold-const.c (fold_build_cleanup_point_expr): New function.
	* tree.h (fold_build_cleanup_point_expr): Prototype.

cp/ChangeLog:
	* semantics.c (maybe_cleanup_point_expr): Call
	fold_build_cleanup_point_expr.
	(maybe_cleanup_point_expr_void): New function.
	(add_decl_expr): Call maybe_cleanup_point_expr_void.
	(finish_expr_stmt): Likewise.
	(finish_return_stmt): Likewise.
	(finish_for_expr): Likewise.
	(finish_asm_stmt): Likewise.
	* typeck.c (condition_conversion): Call
	fold_build_cleanup_point_expr.
	
testsuite/ChangeLog:

	* g++.dg/init/for3.C: New test.
	* g++.dg/opt/switch2.C: New test.
	* g++.dg/warn/Wreturn-2.C: New test.




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