[clang] [llvm] [HLSL][Matrix] Make Matrix InitListExprs and AST row-major order, and respect /Zpr and /Zpc in codegen (PR #182904)

[Deric C. via cfe-commits]

Icohedron wrote:

Any objections to merging this PR? I will merge it starting next week (March 2nd) if there are no objections.

https://github.com/llvm/llvm-project/pull/182904