[Patch, Fortran] PR50815 - don't -fcheck=bounds of deferred-length strings

[Tobias Burnus]

gfortran had an ICE when trying to insert a check whether the character 
length between actual and dummy argument matches. This check is 
pointless for deferred-length character arguments - thus, no bounds 
check should be generated.

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

Tobias
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