[PATCH] Fix PR C++/28989, post-increment of bool is wrongly considered a lvalue

[Andrew Pinski]

On Mon, 2006-09-18 at 13:42 -0700, Mark Mitchell wrote: 
> Does it work to make lvaluep look through SAVE_EXPRs to the thing saved, 
> instead?

Actually that is the real issue that we are looking through SAVE_EXPRs
when they are not be lvalues as they either references an early
SAVE_EXPRs' value or just a place holder for a rvalue.
This patches changes SAVE_EXPRs to be not lvalues in the function
lvalue_p_1 and it fixes the regression.

OK? Bootstrapped and tested with no regressions.

Thanks,
Andrew Pinski

cp/ChangeLog:
	* tree.c (lvalue_p_1 <case SAVE_EXPR>): SAVE_EXPRs are never
	lvalues.

testsuite/ChangeLog:

	* g++.dg/expr/lval3.C: New test.
	* g++.dg/expr/lval4.C: New test.
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