Function get_inner_matrix_of_global_uniform 

fn get_inner_matrix_of_global_uniform(
    module: &Module,
    base: Handle<Expression>,
    func_ctx: &FunctionCtx<'_>,
    direct: bool,
) -> Option<MatrixType>

Returns the matrix data if the access chain starting at base:

• starts with an expression with resolved type of TypeInner::Matrix, or
• contains zero or more expressions with resolved type of TypeInner::Array of TypeInner::Matrix if direct = false
• and ends with an Expression::GlobalVariable in AddressSpace::Uniform