RFR: JDK-8258603 c1 IR::verify is expensive [v7]

[Ludvig Janiuk]

On Tue, 4 Jan 2022 20:04:45 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Ludvig Janiuk has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - whitespace
>>  - fix on SSOT
>>  - SSOT part 2
>
> And please update copyright year to 2022 in changed files headers.

@vnkozlov Done, although using ASSERT in c1_IR.hpp didn't work because c1_Compilation.cpp makes several unguarded calls to IR::verify. I've left it with NOT_DEBUG_RETURN, hope that is ok.

I hope I've covered all the issues now, but please point it out if I've missed something.

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PR: https://git.openjdk.java.net/jdk/pull/6850