outerProduct is now implemented for dynamic
variables. All outerProduct dEQP tests pass.

Change-Id: I81e29640347844bd9548030aa69ffbb2eb060fdf
Reviewed-on: https://swiftshader-review.googlesource.com/3283Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>