[Patch, fortran] PR45305 - Array-valued calls to elementals are not simplified

[Paul Richard Thomas <paul dot richard dot thomas at gmail dot com>]

I posted a patch for this on the PR in August 2010. Dominique pointed
out that it caused repeated error messages in some testcases; eg.
arithmetic_overflow_1.f90

As it happens, that seems to have crept in at some time even without
the patch for this PR. Nevertheless, I have modified the patch
slightly to prevent any more escalation. Apart from this, the patch is
very straightforward.

Bootstraps and regtests on FC28/x86_64 - OK for trunk and....?

Paul

2018-06-27  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/45305
    * expr.c : Add a prototype for scalarize_intrinsic_call.
    (gfc_simplify_expr): Use scalarize_intrinsic_call for elemental
    intrinsic function calls.
    (scalarize_intrinsic_call): Add 'init_flag' argument. Check if
    the expression or any of the actual argument expressions are
    NULL. Before calling gfc_check_init_expr, check 'init_flag'.
    Only simplify the scalarized expressions if there are no errors
    on the stack.
    (gfc_check_init_expr): Set 'init_flag' true in the call to
    scalarize_intrinsic_call.

2018-06-27  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/45305
    * gfortran.dg/scalarize_parameter_array_3.f90: New test.

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