Segfault with default initialization

[bmanga]

Given the following code:

struct Vector4 {
    float data[4] = {};
};

kernel void fun() {
#ifdef FAIL
    Vector4 m;
#else
    Vector4 m = {};
#endif
}

Compiling using -cl-std=CLC++ --inline-entry-points -DFAIL results in

Instruction not handled:   %arrayinit.cur.i = phi ptr addrspace(4) [ %m.ascast, %entry ], [ %arrayinit.next.i, %arrayinit.body.i ]

I'm assuming this has something to do with where the initializer data is stored and is related to #1288 , but I wonder if this is easier to fix.