Profile merging code fix

[Nathan Sidwell]

Jan Hubicka wrote:
> the merging code in __bb_exit_func contains bug of not storing merget
thanks for catching that.

> statistics.  We will also need to add new field containing number of runs
> merged into the file to stop confusing GCC's feedback.  I will send 
ok. btw, I'm about halfway through implementing a more robust
file format for the .da, .bb & .bbg files. I'll add such a field
there too.

nathan

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