[C++ PATCH] Fix constant integral vars with parenthesized initializers in templates (PR c++/36089)

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

The testcase below is rejected if array size is determined by const int
var with parenthesized initializer inside of a template, works if
it is initialized with = instead.  [dcl.init]/8 says the two forms
should be generally equivalent except for classes.
cp_finish_decl says:
      /* Generally, initializers in templates are expanded when the
         template is instantiated.  But, if DECL is an integral
         constant static data member, then it can be used in future
         integral constant expressions, and its value must be
         available. */
The problem is that the array size checking is done when
processing_template_decl when the size isn't value dependent,
but can't handle TREE_LIST DECL_INITIAL.  Below are two alternative
patches, the first one teaches integral_constant_value about it,
the second instead canonicalizes DECL_INITIAL at cp_finish_decl time
even when processing_template_decl for integral constant vars.

Both patches passed make check-g++.  I'll do full bootstrap/regtest
on one of them if you pick one.

	Jakub

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