[compiler-rt] [scudo] Add hooks to mark the range of realloc (PR #74353)

[Christopher Ferris via llvm-commits]

cferris1000 wrote:

To add concrete numbers, I looked through the memory traces we have taken on Android devices, and reallocs tend to be about 1%-2% or 3%-4% of the operations. The highest I saw was 6%, which seems to be a particular app. So the chance of hitting this issue is already relatively low, but it's possible that you are seeing a different rate that is higher than on Android.

https://github.com/llvm/llvm-project/pull/74353