CBE: reuse locals with the same `CType` instead of `Type`
Many `Type`s can correspond to the same `CType`, so this reduces the
number of used locals by 27760 when compiling only-c.
Also, disabled some tests that were only passing by accident and
shouldn't really be considered working.
1453a595aaJacob Young committed on 2/25/2023, 4:41:54 AMparent6398aab