RFR: 8371650: Add CMakeLists.txt and compile_commands.json into .gitignore

[Erik Joelsson]

On Wed, 12 Nov 2025 02:38:48 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> Some IDE and LSP expect to find these files in the project root.
> It convenient to place them in src/hotspot, so idea and vim automatically find the root for hotspot project. 
> 
> This fix just add these files and some temporary dirs in my ws into .gitignore. Shouldn't harm anyone.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28248#pullrequestreview-3474143561