[PATCH] Fix PR C++/28886, Template specialization with array rejected

[Andrew Pinski]

The problem here is that fold will produce a NON_LVALUE_EXPR when
figuring out the size of the array but we are not ready to handle that.
This patch fixes the problem by stripping out the NON_LVALUE_EXPR right
after the fold that adds it.

OK? Bootstrapped and tested on i686-linux-gnu with no regressions.

Thanks,
Andrew Pinski

cp/ChangeLog:
	* pt.c (unify): Strip nops that don't change the type after
	calling fold for finding the length of the array.

testsuite/ChangeLog:
	* g++.dg/template/partial-specialization-array.C: New test.
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