Subzero's sqrt intrinsic implementation was assuming only scalar float
args when moving the result to the destination, despite its sqrt
implementation supporting vector float.

Bug: b/130459196
Change-Id: I1c5baf2dc72448785add421c87900964f877ce6f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38872
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>