RFR (XL): 8075492: update IGV in hs-comp

[Roland Westrelin]

>>> Webrev: http://cr.openjdk.java.net/~mhaupt/8075492/webrev.00
>> 
>> Why do you need the change to BranchData::print_data_on()?
> 
> the extra line break otherwise emitted would confuse IGV's input parsing logic, generating a plethora of warning messages.

BranchData::print_data_on() is also used by PrintMethodData which prints a nicely formatted dump of profiling data. BranchData is not the only profiling data that is printed on multiple lines. Why does this one in particular confuses the IGV?

Roland.