[compiler-rt] [TySan] Intercept malloc_size on Apple platforms. (PR #122133)

[Sean McBride via llvm-commits]

seanm wrote:

> I've download this patch locally, and can confirm it fixes my issue. Now 94% of cmake's unit tests pass, which is the kind of fraction one might expect using a new stress testing tool. Now to actually take a look at some...

Actually, looks like most (all?) are some weird linking issue:

```
dyld[82529]: Symbol not found: __ZNSt13exception_ptr31__from_native_exception_pointerEPv
  Referenced from: <9FF30C7F-ED6B-3C65-AE51-8D211D47EBA4> /Users/sean/external/cmake-bin/Tests/CMakeLib/CMakeLibTests
  Expected in:     <C4E10D69-6F13-32B1-831D-82DA32D7DB88> /usr/lib/libc++.1.dylib
```


https://github.com/llvm/llvm-project/pull/122133