RFR: 8311077: Fix -Wconversion warnings in jvmti code [v4]

[David Holmes]

On Fri, 30 Jun 2023 13:10:06 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review change for mostly fixing return types in the constant pool and metadata to fix -Wconversion warnings in JVMTI code.  The order of preference for changes are: 1. change the types to more distinct types (fields in the constant pool are u2 because that's their size in the classfile), 2. add direct int casts if the value has been checked in asserts above, and 3. checked_cast<> if not verified, and 4. added some pointer_delta_as_ints where needed.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   David's suggestions.

src/hotspot/share/runtime/jfieldIDWorkaround.hpp line 92:

> 90:       result &= small_offset_mask;  // cut off the hash bits
> 91:     }
> 92:     return result;

Doesn't this trigger a warning as we go from unsigned to signed?

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PR Review Comment: https://git.openjdk.org/jdk/pull/14710#discussion_r1249960932