[clang] [flang] [llvm] [flang] Add runtime trampoline pool for W^X compliance (PR #183108)

[Eugene Epshteyn via cfe-commits]

eugeneepshteyn wrote:

> What is the plan to enable by default?

Personally, I would like this implementation to spend some time under the compiler option guard, so that we could do more tests internally before it's made default.

For the future, is there any chance for LLVM proper to adapt such approach and introduce new stack-less trampoline intrinsics?

https://github.com/llvm/llvm-project/pull/183108