[patch, fortran] Fix PR 82567

[Thomas Koenig]

Hello world,

this patch fixes a regression with long compile times,
which came about due to our handling of array constructors
at compile time.  This, togeteher with a simplification in
front end optimization, led to long compile times and large
code.

Regression-tested. OK for trunk and the other affected branches?

Regards

	Thomas

2917-10-17  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/82567
         * frontend-passes.c (combine_array_constructor): If an array
         constructor is all constants and has more elements than a small
         constant, don't convert a*[b,c] to [a*b,a*c] to reduce compilation
         times.

2917-10-17  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/82567
         * gfortran.dg/array_constructor_51.f90: New test.
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