This reverts 92deacbe commit.

It is wrong to maintain a mapping from a constant index to a type
field, because different constant types do not share an index -
boolean constant 0 is supposed to co-exist with floating point
constant 0, not replace it. Drawprim and other code using the type
array to decide whether to look up a constant in bools, floats, or
ints is wrong - you can't make that decision based on the index.

From const%lu to C%lu for consistency (to match pshaders).

New tests that check if GetDIBits works with a bitmap that is selected
in a device context (works in Windows, should fail according to the
API documentation)