Fortran: checking and simplification of RESHAPE intrinsic [PR103794]

Fortran: checking and simplification of RESHAPE intrinsic [PR103794]

gcc/fortran/ChangeLog:

	PR fortran/103794
	* check.cc (gfc_check_reshape): Expand constant arguments SHAPE and
	ORDER before checking.
	* gfortran.h (gfc_is_constant_array_expr): Add prototype.
	* iresolve.cc (gfc_resolve_reshape): Expand constant argument SHAPE.
	* simplify.cc (is_constant_array_expr): If array is determined to be
	constant, expand small array constructors if needed.
	(gfc_is_constant_array_expr): Wrapper for is_constant_array_expr.
	(gfc_simplify_reshape): Fix check for insufficient elements in SOURCE
	when no padding specified.

gcc/testsuite/ChangeLog:

	PR fortran/103794
	* gfortran.dg/reshape_10.f90: New test.
	* gfortran.dg/reshape_11.f90: New test.