Glsl mat constructor (row majoror column major)

Given a declaration in the shader as

mat2 M = mat2(vec2(1.0,2.0),
              vec2(3.0,4.0) );
vec2 P = M*vec2(5.0,6.0);

How is the matrix filled in ie is it row major so

P=|1 2||5|
  |3 4||6|

or is it column major

P=|1 3||5|
  |2 4||6|

Column major.

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