ConstantInt::get{True,False} moved to LLVMContext Non-breaking build fix for LLVM r76533. Also fixes a context related bug in GarbageCollect2Stack.

module union3;

union vec3
{
    struct { float x,y,z; }
    float[3] xyz;
}

void main()
{
    vec3 v;
    assert(&v.y is &v.xyz[1]);
}