[llvm] [CodeLayout] Size-aware machine block placement (PR #109711)

[Zhaoxuan Jiang via llvm-commits]

nocchijiang wrote:

@spupyrev Thanks for the demo code! I tested it on the codebase I mentioned earlier and it appears to regress the compression ratio significantly (~40%). It turns out it is indeed a WILD guess.

https://github.com/llvm/llvm-project/pull/109711