[llvm] [MatrixIntrinsics] Add row-major support for llvm.matrix.transpose

Summary:
Only column-major was supported so far. This adds row-major support as well.
Note that we probably also want very efficient SIMD implementations for the
various target platforms.

Bug:
https://bugs.llvm.org/show_bug.cgi?id=46085

Reviewers: nicolasvasilache, reidtatge, bkramer, fhahn, ftynse, andydavis1, craig.topper, dcaballe, mehdi_amini, anemet

Reviewed By: fhahn

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80673