Clspv crashes accessing first field after copying other fields with memcpy

[BukeBeyond]

struct E
{
    int i1, i2, i3; // Fails
    // int i1, i2; // OK, struct smaller
};

struct S
{
  int i1, i2;
  struct E e1, e2;
};

kernel void Kernel(global struct S* s)
{
    s->e1 = s->e2; // memcpy destabilizes the following:
    s->i1 = 0; // Fails, writing first field
    // s->i2 = 0; // OK, second field
    // s->i2 = s->i1; // Fails, reading first field
}

https://godbolt.org/z/h6e4oM8hs

Likely related to #1176 #1177