Making sure we extend 1010102 to the full 16 bit range
fixes 51 of the 53 failures found in ToT dEQP-VK.*a2b10*

Also added a utility function to OR all elements of an
int vector, which allows us to use more vector operations
(as opposed to scalar) while improving the readability.

Bug: b/146633956
Change-Id: If8b946c45cf27f5868d7a97166e21dba565ed72f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39768Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>