SPIRV objects have arbitrary sizes -- they are not tied to previous
shader APIs' vec4-centric view of the world. In order to be able to
allocate space for both variables and ssavalues, we need to know how
many scalar components are present in each object.

Bug: b/120799499

Change-Id: I58551264eba5011be9bd01135cb35d541463993b
Reviewed-on: https://swiftshader-review.googlesource.com/c/23168Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>