[clang] [clang] Fix constant-evaluator crash on array new with no size (PR #207730)

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DaanishD20 wrote:

Thanks for the greeting. I confirm that I have read the LLVM contribution policies, including the LLVM AI Tool Use Policy. This change was drafted with AI assistance (Claude Code), which is now noted in the PR description and via an `Assisted-by:` trailer on the commit. I have reviewed all of the code and text, understand the change, and am accountable for it as the author.

https://github.com/llvm/llvm-project/pull/207730