[compiler-rt] [scudo] Add `__scudo_get_info` symbol to export stats to a buffer. (PR #130273)

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ChiaHungDuan wrote:

Sorry I may not say this clearly. It's better to have `copyToBuffer` follow the new convention in this change and have another CL to fix the uses in `getStats`, .etc.

https://github.com/llvm/llvm-project/pull/130273