re PR fortran/16946 (sum (array, mask) is not accepted)

re PR fortran/16946 (sum (array, mask) is not accepted)

fortran/
PR fortran/16946
* check.c (gfc_check_reduction): New function.
(gfc_check_minval_maxval): Removed.
(gfc_check_product): Removed.
(gfc_check_sum): Removed.
* intrinsic.h: Add/remove declarations for these.
* gfortran.h: Add field f3red to union gfc_check_f.
* intrinsic.c (add_sym_3red): New function.
(add_functions): Register maxval, minval, product, and sum intrinsics
through add_sym_3red.
(check_specific): Handle f3red union field.
* iresolve.c: Whitespace change.

testsuite/
PR fortran/16946
* gfortran.dg/reduction.f90: New testcase.

From-SVN: r86255