[fortran, patch] Add DREAL simplification (last remaining elemental required for initialization expressions)

[FX]

Attached patch adds a (rather trivial) simplification routine for the DREAL intrinsic (a GNU extension), which is the last unimplemented simplification for elemental intrinsics (PR 38718, which tracks this issue, also lists LSHIFT and RSHIFT, but both have gained simplification routines since its last update).

Regtested on x86_64-linux, comes with a testcase. OK to commit to trunk?
FX


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