Reapply "SystemZ: Fold copy of vector immediate to gr128" (#91099)
This reverts commit a415b4dfcc02e3e82b8c8a7836f7c04b9d65dc9b.
Modify the instruction in place to transform it into a REG_SEQUENCE,
which is what other implementations of foldImmediate do. Also start
erasing the def instruction if there are no other uses.
Fixes #91110.
llvm-project
eb75af22 - Reapply "SystemZ: Fold copy of vector immediate to gr128" (#91099)
