LLVM backend assertion when casting a matrix literal

[goldenbergdaniel]

Context

Odin: dev-2025-03-nightly
OS: Ubuntu 24.10, Linux 6.11.0-19-generic
CPU: AMD Ryzen 7 6800H with Radeon Graphics
RAM: 14703 MiB
Backend: LLVM 18.1.6

Expected Behavior

The code should either compile or generate a checker error.

Current Behavior

The following LLVM backend assertion is triggered:
Assertion Failure: elem_count == max_count 9 != 4

Failure Information (for bugs)

Steps to Reproduce

mat := cast(matrix[2,2]f32) matrix[3,3]f32{1,0,0,0,1,0,0,0,1}

https://godbolt.org/z/e1WTGEKd6