RFR: 8299974: Replace NULL with nullptr in share/adlc/

[Vladimir Kozlov]

On Thu, 25 May 2023 12:23:27 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Fixed! Thank you.

May be I was not clear. I asked to add missing `{}` and correct spacing: `if (cond) {` instead of current `if( cond )`

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PR Comment: https://git.openjdk.org/jdk/pull/14008#issuecomment-1563157255