RFR: 8364087: Amend comment in globalDefinitions.hpp on "classfile_constants.h" include

[Stefan Karlsson]

On Thu, 31 Jul 2025 11:00:07 GMT, Francesco Andreuzzi <duke at openjdk.org> wrote:

> The comment was introduced in [8231844](https://github.com/fandreuz/jdk/commit/fce43203699336e9513d06cd54b66735e93234a4). I looked around, and `<jvm.h>` is not included in any of the headers included by `globalDefinitions.hpp`, neither now nor in the original commit. Thus, I propose to amend the comment, as it [turned out to be confusing](https://github.com/openjdk/jdk/pull/26428/files#r2229575525) during an header clean up. 
> 
> Including `classfile_constants.h` is needed for e.g. `JVM_T_CHAR`, as stated by the comment, thus I'm going to leave that part intact.

I propose that we remove this comment entirely.

Comments that only state why we include a specific file tends to become stale and incorrect when we evolve the code base.

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Changes requested by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26573#pullrequestreview-3075026801