Added a few types:
- Half float
- 2_10_10_10_INT
- 2_10_10_10_UINT

Related dEQP tests pass.

Change-Id: I2fb04fee89c3d69367dc2e401ac53d9758add9bf
Reviewed-on: https://swiftshader-review.googlesource.com/5356Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>