This should have been true for the constructor that takes a dynamic offset. Surprising that this hadn't caused any tests to fail.

Bug: b/131224163
Change-Id: I00fcfb99e265c7a378c40817ae8f84104e4a2a3d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33051Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>