RFR: 8255245: C1: Fix output of -XX:+PrintCFGToFile to open it with visualizer [v2]

[Christian Hagedorn]

On Mon, 26 Oct 2020 22:29:06 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> Christian Hagedorn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Move print_on definition to header file
>
> src/hotspot/share/c1/c1_LinearScan.hpp line 641:
> 
>> 639:   }
>> 640:   // Special version for compatibility with C1 Visualizer.
>> 641:   void print_on(outputStream* out, bool is_cfg_printer) const;
> 
> then why not just print_on(outputStream* out, bool is_cfg_printer=false) const directly? those 3 lines can be further saved. :)

This would be a good idea but unfortunately that does not compile as it complains that `virtual void AllocatedObj::print_on(outputStream*) const` was hidden.

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PR: https://git.openjdk.java.net/jdk/pull/837