Change an assignment to an assert in varpool

[Bernd Schmidt]

I noticed that we set node->definition = true in varpool_assemble_decl. 
The surrounding code suggests that we should only ever get there if 
definition is already true, so I changed it to an assert. The question 
is interesting for some modifications I'm making for ptx (which requires 
declarations for external variables in the assembly).

The only thing that was tripped by the assert was a variable created by 
asan. AFAICT the problem there is that asan calls varpool_assemble_decl 
when it should be calling varpool_finalize_decl.

Bootstrapped and tested on x86_64-linux, ok?


Bernd
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