RFR: 8313882: Fix -Wconversion warnings in runtime code [v6]

[Dean Long]

On Thu, 10 Aug 2023 00:13:21 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> src/hotspot/share/runtime/objectMonitor.hpp line 238:
>> 
>>> 236:   //
>>> 237:   #define OM_OFFSET_NO_MONITOR_VALUE_TAG(f) \
>>> 238:     ((in_bytes(ObjectMonitor::f ## _offset())) - (int)markWord::monitor_value)
>> 
>> Suggestion:
>> 
>>     ((in_bytes(ObjectMonitor::f ## _offset())) - (intptr_t)markWord::monitor_value)
>
> If this is intptr_t, it'll get a Wconversion warning on the uses that expect int.

OK, in that case checked_cast<int>() would be more correct.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15177#discussion_r1289388423