[PATCH, committed] Fortran: fix frontend memory leaks for ALLOCATE with SOURCE [PR109010]

[Harald Anlauf]

Dear All,

the attached obvious patch fixes frontend memleaks for trivial code such
as

   program p
     real, pointer :: x(:)
     allocate (x, source = reshape ([1.], [1]))
   end

which showed 4(!) references to __gmp_default_allocate when running f951
under valgrind.  For ALLOCATE, component expr3 of the SOURCE expression
was the culprit.

Regtested clean on x86_64-pc-linux-gnu.

Pushed as r16-4013-g518ec01b363ba7 .

Thanks,
Harald

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