C++ PATCH for c++/23357

[Jason Merrill]

The problem in this PR was that we told the middle-end that SIZEOF_EXPR and
ALIGNOF_EXPR were unary expressions, which they are not.  They have one
operand, but it isn't an expression.  The middle-end code properly assumed
that any operand of a unary expression is an expression, tried to treat it
as such, and died.  Fixed thus.

Tested on x86_64-pc-linux-gnu, applied to trunk.  Test in
g++.dg/template/sizeof10.C.

2005-09-15  Jason Merrill  <jason@redhat.com>

	PR c++/23357
	* cp-tree.def (SIZEOF_EXPR, ALIGNOF_EXPR): Change code class to
	tcc_expression.

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