Roll Vulkan-Loader from a638f3acae94 to dc8a96d60b6b (2 revisions)

a638f3acae..dc8a96d60b

2020-10-07 pdaniell@nvidia.com Fix formatting issue.
2020-10-07 pdaniell@nvidia.com Fix some issues when EnumerateAdapterPhysicalDevices is available

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/vulkan-loader-angle-autoroll
Please CC timvp@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: None
Tbr: timvp@google.com
Change-Id: Ief8353ba32e633b83f4135bd5dc2d00bb6349e13
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2461406
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -86,7 +86,7 @@ vars = {
   'vulkan_headers_revision': '94ff600cc8623a2fd270cc14b14def3fca12ffaf',
 
   # Current revision of Khronos Vulkan-Loader.
-  'vulkan_loader_revision': 'a638f3acae949d88d9ff358087e9ac7cdc3970f3',
+  'vulkan_loader_revision': 'dc8a96d60b6b03bd77f88f19d5028d91aab220f1',
 
   # Current revision of Khronos Vulkan-Tools.
   'vulkan_tools_revision': '1abaced34b84831f60226ce67a702b2d841e1d87',