[LowerMatrixIntrinsics] Fix type suffix for matrix.multiply.* (#100940)
Based on the [proposal
PDF](https://llvm.org/devmtg/2020-09/slides/Hahn-Matrix_Support_in_LLVM_and_Clang.pdf)
and the test code under
[llvm/test/Transforms/LowerMatrixIntrinsics](https://github.com/llvm/llvm-project/tree/main/llvm/test/Transforms/LowerMatrixIntrinsics),
the suffix for the `@llvm.matrix.multiply.*` intrinsic should be {output
matrix type}.{input matrix 1 type}.{input matrix 2 type} (e.g.,
`@llvm.matrix.multiply.v4i32.v4i32.v4i32`).
This PR corrects the places where these suffixes do not follow the
aforementioned format.