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

module union1;

union U
{
    float f;
    int i;
}

void main()
{
    float f = 2;
    U u = U(f);
    assert(u.i == *cast(int*)&f);
}