RFR: 8256508: Improve CompileCommand flag [v2]

[Nils Eliasson]

On Fri, 20 Nov 2020 12:32:41 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> Nils Eliasson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Exclude option is handled in compilecommand_compatibility_init
>
> A good usability improvement! 
> 
> I've messed up some minor details in these commands in one way or another more times than I've gotten things right on the first try and been left wondering why my commands have no effect. This should help avoid a significant portion of easy mistakes. 
> 
> I think the error in the old compile command is that int needs to be intx (and of course there's no java/util/String)?

@cl4es @vnkozlov 
I did a very minor update to compilerDirectives.hpp. The Exclude is already handled separately in init_compilecommand_compatibility. This is back to how it was before this PR.

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PR: https://git.openjdk.java.net/jdk/pull/1276