This cl adds a new utility function to count
the number of components used by an input.

Bug: b/171415086
Change-Id: I348959ccd8945d2f336384cf7d905d3140231e4e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/51736
Commit-Queue: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>