Revert "SystemZ: Fold copy of vector immediate to gr128" (#91099)
Fails here: https://lab.llvm.org/buildbot/#/builders/239/builds/6893 https://lab.llvm.org/buildbot/#/builders/5/builds/43113 https://lab.llvm.org/buildbot/#/builders/168/builds/20228 Reverts llvm/llvm-project#90706
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7c1d9b15