[llvm] [BOLT] Push code to higher addresses under options (PR #146180)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

> General question: with use-old-text and hot-functions-at-end, what's in the space that is not used? Is it the original code, or emitted padding/traps?

Remnants of the old code. It's the same as without `--hot-functions-at-end`, just on the other side.

https://github.com/llvm/llvm-project/pull/146180