RFR: 8313882: Fix -Wconversion warnings in runtime code [v2]

[Coleen Phillimore]

On Tue, 8 Aug 2023 20:10:48 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Make bytecode.hpp index() functions return u2 not long.
>
> src/hotspot/share/runtime/arguments.cpp line 1215:
> 
>> 1213:       }
>> 1214:     }
>> 1215:     c = getc(stream);
> 
> How about int c0 for the getc value, then the first line in the loop does
> char c = checked_cast<char>(c0);
> No other changes should be needed.

There was a reason that c had to be an int.  Now I'll have to rebuild and figure it out again.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15177#discussion_r1288514952