[Patch, Fortran] PR57553 - fix two STORAGE_SIZE bugs

[Tobias Burnus]

This patch fixes two issues:
*  storage_size('aa')  was rejected as constant expression - as 
ts.u.cl->length == 0.
* In trans*.c, there was a fold_convert missing (-> ICE). Additionally, 
I have replaced the detour to generate a tree containing the value "8" 
via a fortran expression.

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias

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