D3D11 FL9_3: Fix bug in R32F vertex format emulation.
D3D11 FL9_3: Fix bug in R32F vertex format emulation.

We would allow direct storage when this format is emulated. Noticed
this when making a test which used a single float vertex format.

BUG=angleproject:1635

Change-Id: Ia2164b0f311b27f24b6aa7760eb9f9a3834c6044
Reviewed-on: https://chromium-review.googlesource.com/451578
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

MSOpenTech/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle,ecoal95/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,ppy/angle