[clang] Disable FTZ/DAZ when compiling shared libraries by default. (PR #80475)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> Do you only set the register for kernel entries?

Yes, it's the pre-initialized state. Non kernels can't be arbitrarily invoked from the host 

>  Is the attribute ignored for other functions?

No, it's an informative attribute about that the mode is. The compiler isn't trying to fix up the modes for you. If you enter the function with the wrong mode, you get what you get. 



https://github.com/llvm/llvm-project/pull/80475