C++ PATCH for c++/52248 (ICE with -ftime-report and undefined label)

[Jason Merrill]

Here we can get to define_label from within poplevel, which results in 
recursive starting of TV_NAME_LOOKUP.  The obvious solution is to just 
use cond_start/stop in define_label.

Tested x86_64-pc-linux-gnu, applying to trunk.
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