[llvm] [AArch64][GlobalISel] Do not run the Localizer at -O0 (PR #177359)

[David Green via llvm-commits]

davemgreen wrote:

OK thanks. I think everyone agrees that the localizer needs to work quite differently than it does at the moment. Due to the performance improvements, and the reports that it is causing 30x (or more) compile time increase, lets get this in at least of O0. The other optimization levels can be worked on later.

https://github.com/llvm/llvm-project/pull/177359