RFR: 8300732: Whitebox functions for Metaspace test should use byte size

[Thomas Stuefe]

On Thu, 4 Jul 2024 15:18:29 GMT, Sonia Zaldana Calles <szaldana at openjdk.org> wrote:

> Hi all, 
> 
> This PR addresses [8300732](https://bugs.openjdk.org/browse/JDK-8300732) switching Whitebox Metaspace test functions to use bytes as opposed to words. 
> 
> Testing: 
> - [x] `test/hotspot/jtreg/runtime/Metaspace` tests pass. 
> 
> Thanks, 
> Sonia

First cursory look, will look again later

src/hotspot/share/prims/whitebox.cpp line 1715:

> 1713: // MetaspaceTestContext and MetaspaceTestArena
> 1714: WB_ENTRY(jlong, WB_CreateMetaspaceTestContext(JNIEnv* env, jobject wb, jlong commit_limit, jlong reserve_limit))
> 1715:   if (commit_limit % BytesPerWord != 0) {

Use is_aligned() from utilities/align.hpp

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PR Review: https://git.openjdk.org/jdk/pull/20039#pullrequestreview-2159200244
PR Review Comment: https://git.openjdk.org/jdk/pull/20039#discussion_r1665875107