Craig Topper 50ea2d8551
[RISCV] Extract vector from passthru when combining tuple_extract+vlseg. (#172743)
The passthru operand is a tuple. We need to extract the correct field
vector from it.

Existing tests only handled the undef passthru case which accidentally
worked. Possibly due to IMPLICIT_DEF being converted to noreg.

Fixes #172628.
2025-12-17 22:45:47 -08:00
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