This resolves some rounding issues in these vk cts tests for m32:

dEQP-VK.glsl.operator.float_compare.equal.highp_vec4_vertex
dEQP-VK.glsl.operator.float_compare.equal.mediump_vec4_vertex
dEQP-VK.glsl.operator.float_compare.greaterThan.highp_vec4_vertex
dEQP-VK.glsl.operator.float_compare.greaterThan.mediump_vec4_vertex
dEQP-VK.glsl.operator.float_compare.greaterThanEqual.highp_vec4_vertex
dEQP-VK.glsl.operator.float_compare.greaterThanEqual.mediump_vec4_vertex
dEQP-VK.glsl.operator.float_compare.lessThan.highp_vec4_verte
dEQP-VK.glsl.operator.float_compare.lessThan.mediump_vec4_vertex
dEQP-VK.glsl.operator.float_compare.lessThanEqual.highp_vec4_vertex
dEQP-VK.glsl.operator.float_compare.lessThanEqual.mediump_vec4_vertex
dEQP-VK.glsl.operator.float_compare.notEqual.highp_vec4_vertex
dEQP-VK.glsl.operator.float_compare.notEqual.mediump_vec4_vertex