[llvm] [AArch64] Use GISel for optnone functions (PR #174746)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> I spent some time trying to lower the compile time impact. I have modified ResetMachineFunction to perform a more lightweight reset when deciding not to perform the GlobalISel pipeline.

Can you split that to a separate change too?



https://github.com/llvm/llvm-project/pull/174746