[llvm] [PowerPC] Update to run VSX FMA Mutation pass before Register Coalescer for `-schedule-ppc-vsx-fma-mutation-early` (PR #111696)

[zhijian lin via llvm-commits]

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+; RUN: llc -verify-machineinstrs -mcpu=pwr10 -disable-ppc-vsx-fma-mutation=false -ppc-asm-full-reg-names -schedule-ppc-vsx-fma-mutation-early < %s | \
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diggerlin wrote:

it just for power10, The `xxspltiw`  is introduced in power10 , I think linux has the same problem, but linux will generate a different asm instructions set . I think testing in AIX is enough for the code change 

https://github.com/llvm/llvm-project/pull/111696