RFR: 8313785: Fix -Wconversion warnings in prims code

[Dean Long]

On Fri, 4 Aug 2023 14:37:07 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This patch fixes Wconversion in code in the src/hotspot/share/prims directory.  Most of the changes correct the types.  jfieldID's are created with the int offset returned by InstanceKlass::field_offset().
>      int     field_offset      (int index) const { return field(index).offset(); }
> 
> So when we get the field offset back, it's an int.
> 
> Also stackwalker passes jlong, so made that consistent.
> 
> Tested with tier1 on Oracle supported platforms.

src/hotspot/share/prims/jni.cpp line 209:

> 207: 
> 208: 
> 209: intptr_t jfieldIDWorkaround::encode_klass_hash(Klass* k, intptr_t offset) {

The caller always passes an int, so why not change the parameter to int?
Suggestion:

intptr_t jfieldIDWorkaround::encode_klass_hash(Klass* k, int offset) {

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PR Review Comment: https://git.openjdk.org/jdk/pull/15160#discussion_r1284851860