[Patch, Fortran] PR 50163 - ICE with nonconst expr in init expr

[Tobias Burnus]

The bug is a regression: An error was printed with 4.1.x but since 4.3.x 
one gets an ICE. [No idea what GCC 4.2 does.] The solution is simply: 
Returning if there is a MATCH_ERROR.

See PR (esp. comment 2) for a more detailed description:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50163#c0

Build and regtested on x86-64-linux.
OK for the trunk? And to which version should it be backported? Only 
4.6? Also 4.5? Or even 4.4?

Tobias
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