GLSL bitwise NOT implementation

GLSL bitwise NOT implementation

The bitwise NOT operation is supported for integer types in GLSL.
All the plumbing was already there, only the actual call was missing.

In dEQP, all shaders.operator.unary_operator.bitwise_not tests pass.

Change-Id: I938104b860441f6b2df6c807d578f651e5cd2516
Reviewed-on: https://swiftshader-review.googlesource.com/11108
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>