[Patch, fortran] PR24311 - MERGE with character arguments causing ICE in IO statements.

[Paul Thomas]

:ADDPATCH fortran:

This problem was caused by a patch to trans-io.c(gfc_trans_transfer), 
which changed from transferring arrays element by element to passing the 
array descriptor to the library. This failed because 
gfc_conv_expr_descriptor was unable to handle the unusual(unique?) 
phenomenon of a character array that has no charlen in the typespec. 
This has been fixed by the direct method of writing a charlen in 
iresolve.c(gfc_resolve_merge). This seems like the right place to do 
this, on the grounds that, no matter what, the output from MERGE will be 
correctly loaded with a character length.

Bubblestrapped and regtested on FC3/i686. OK for mainline and 4.0?

Paul T
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