re PR c++/83659 (ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821)

re PR c++/83659 (ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821)

	PR c++/83659
	* fold-const.c (fold_indirect_ref_1): Use VECTOR_TYPE_P macro.
	Formatting fixes.  Verify first that tree_fits_poly_int64_p (op01).
	Sync some changes from cxx_fold_indirect_ref.

	* constexpr.c (cxx_fold_indirect_ref): Sync some changes from
	fold_indirect_ref_1, including poly_*int64.  Verify first that
	tree_fits_poly_int64_p (op01).  Formatting fixes.

	* g++.dg/torture/pr83659.C: New test.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r257512