[llvm] [PEI] Materialize registers before calling insertZeroCallUsedRegs (PR #214147)

[Lucas Chollet via llvm-commits]

LucasChollet wrote:

As no one seems to have issues with it, I updated the PR to move the call to `insertZeroCallUsedRegs` just after the existing `scavengeFrameVirtualRegs` call.

https://github.com/llvm/llvm-project/pull/214147