anv: dEQP-VK.graphicsfuzz.cov-multiple-one-iteration-loops-global-counter-write-matrices fails

Test fails during the register allocation phase after printing Maximum 132 registers live at once. Below is the GLSL copied out from the Amber file of the test, for reference. I tried forcing the loop unrolling conditions to return true always, but no loop is unrolled.

#version 320 es

#define LOOP for (int i = 0; i < 1; i++)

precision highp int;
precision highp float;

const int _GLF_global_loop_bound = 100;
int _GLF_global_loop_count = 0;

layout(location = 0) out vec4 _GLF_color;

void main()
{
    mat2x3 m23 = mat2x3(0);
    mat2x4 m24 = mat2x4(0);
    mat3x2 m32 = mat3x2(0);
    mat3 m33 = mat3(0);
    mat3x4 m34 = mat3x4(0);
    mat4x2 m42 = mat4x2(0);
    mat4x3 m43 = mat4x3(0);
    mat4 m44 = mat4(0);

    // Each loop iterates just once.
    LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP {
    LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP {
    LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP { LOOP {
    LOOP { LOOP { LOOP { LOOP { LOOP {
        // Run until _GLF_global_loop_bound is 98.
        do
        {
            _GLF_global_loop_count++;
        }
        while(_GLF_global_loop_count < _GLF_global_loop_bound - 2);

        // Write one to the first matrix element.
        m23[i][i] = 1.0;
        m24[i][i] = 1.0;
        m32[i][i] = 1.0;
        m33[i][i] = 1.0;
        m34[i][i] = 1.0;
        m42[i][i] = 1.0;
        m43[i][i] = 1.0;
        m44[i][i] = 1.0;
    } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } } }

    float sum = 0.0;
    // Iterate twice. The first iteration reads one and the second zero.
    for(int r = 0; _GLF_global_loop_count < _GLF_global_loop_bound; r++)
    {
        _GLF_global_loop_count++;
        sum += m23[0][r];
        sum += m24[0][r];
        sum += m32[0][r];
        sum += m33[0][r];
        sum += m34[0][r];
        sum += m42[0][r];
        sum += m43[0][r];
        sum += m44[0][r];
    }

    // Always true.
    if (sum == 8.0)
        _GLF_color = vec4(1, 0, 0, 1);
    else
        _GLF_color = vec4(0);
}