!IsStorageInterleavedByLane is not quite the same as IsExplicitLayout--
workgroup memory is the exception.

Bug: b/133509497
Change-Id: I4dd055109c0e0f70fa415a75ee383e251cbd509c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31929Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>