RFR: 8374540: Add comment describing implementaiton choices of Math.fma [v3]

[Roger Riggs]

On Tue, 6 Jan 2026 22:52:14 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Add comment describing why Math.fma uses BigDecimal.
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add note on interpreter.

fyi, corrected typo in issue summary, PR description will need the fix too.

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PR Comment: https://git.openjdk.org/jdk/pull/29044#issuecomment-3719524254