Craig Topper 11051d7d86 [RISCV] Constrain register class before replaceRegWith in RISCVMergeBaseOffset. ...

The register being replaced might have a more restrictive register
class due to requirements of the using instruction. We should
constrain the register class to preserve any restrictions.

This was found in our downstream on a custom instruction. I don't
have a test case for upstream currently.

Differential Revision: https://reviews.llvm.org/D154920

2023-07-11 09:53:56 -07:00

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