[compiler-rt] [msan] Dynamically grow kNumStackOriginDescrs (PR #92826)

[Evgenii Stepanov via llvm-commits]

eugenis wrote:

But then, it seems easier to just MAP_NORESERVE a large enough array in msan_init. It can be really large then, no concerns about relocation offset.

https://github.com/llvm/llvm-project/pull/92826