[clang] [clang][Interp] Implement dynamic memory allocation handling (PR #70306)

[Timm Baeder via cfe-commits]

tbaederr wrote:

> I know there is UB in there (https://github.com/llvm/llvm-project/issues/94741) so this is not unsurprising.

Ah, interesting. Didn't know about that issue

https://github.com/llvm/llvm-project/pull/70306