[msan] Mark allocator padding as uninitialized, with new origin tag (#157187) This is follow-up work per discussion in https://github.com/llvm/llvm-project/pull/155944#discussion_r2311688571. If the allocator reserves more space than the user requested (e.g., `malloc(7)` and `calloc(7,1)` actually have 16 bytes reserved), the padding bytes will now be marked as uninitialized. Padding poisoning is controlled by the existing flag `poison_in_malloc` (which applies to all allocation functions, not only malloc). Origin tag: - For `calloc` or with track-origins > 1, the origin will be set as a new tag, `ALLOC_PADDING` - Otherwise, the existing `ALLOC` tag will be used. - In the case of ambiguity caused by origin granularity, `ALLOC` will take precedence.
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