[llvm] [ARM][MVE] Invalid tail predication in LowOverheadLoop pass (PR #163217)

[David Green via llvm-commits]

davemgreen wrote:

The pass runs super late - so late that it needs to handle some of the work you would expect to be handled elsewhere itself. I believe the expansion of MQPRCopy goes via ExpandVMOVCopies. IIRC It all runs late so that it can run after the block  placement in the constant island pass, so that it can know that the LE branches are truly within range.

https://github.com/llvm/llvm-project/pull/163217