Philip Reames 73482b457e [RISCV] Fix cost of legal fixed length masked load and stores
We can cost them the same way as a scalable masked load/store. By hitting the default path, we were costing them as if they were being scalarized. This is a significant over estimate.

Differential Revision: https://reviews.llvm.org/D137218
2022-11-02 07:24:38 -07:00
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