SPIRV-Reflect incorrectly reports padded_size for members of a storage block

[matusfedorko]

Given the following shader I think SPIRV-Reflect does not properly report padded_size for the members of SBO:

struct S
{
	float aa;
	float bb;
};

layout(binding = 0, std140) buffer SBO
{
	S s1[2][3];
	S s2;
} sbo;

void main()
{
    gl_Position = vec4(sbo.s1[0][0].aa, 0, 0, 0);
}

I get 4 for both aa and bb, which makes it impossible to correctly compute offsets for members of SBO. In a full reflection of SBO I'd expect to get the following offsets:

s1[0][0].aa -> 0
s1[0][0].bb -> 4
s1[0][1].aa -> 16
s1[0][1].bb -> 20
s1[0][2].aa -> 32
s1[0][2].bb -> 36
s1[1][0].aa -> 48
s1[1][0].bb -> 52
s1[1][1].aa -> 64
s1[1][1].bb -> 68
s1[1][2].aa -> 80
s1[1][2].bb -> 84
s2.aa       -> 96
s2.bb       -> 100

Instead what I see is this:

s1[0][0].aa -> 0
s1[0][0].bb -> 4
s1[0][1].aa -> 8
s1[0][1].bb -> 12
s1[0][2].aa -> 16
s1[0][2].bb -> 20
s1[1][0].aa -> 24
s1[1][0].bb -> 28
s1[1][1].aa -> 32
s1[1][1].bb -> 36
s1[1][2].aa -> 40
s1[1][2].bb -> 44
s2.aa       -> 48
s2.bb       -> 52

Interestingly this works fine for uniform blocks, i.e. if I replace buffer with uniform in my example, padded_size gets reported correctly.