I can't see MSM8994 in the list: https://www.khronos.org/conformance/adopters/conformant-products#vulkan
I wonder if it's planned to be submitted (or perhaps it's passed already?)
I've got rather strange official reply from HTC regarding SD810 Vulkan support on one of their products:
"Upon checking our resources, we have identified that as per Qualcomm's documentation, it appears that the processor for HTC One M9 with Android version 7.0 is not intended to support libvulkan.so."
In this case I'd like to clarify whether MSM8994 is conformant on Khronos/Qualcomm's end or not > does Vulkan supported drivers for A4xx are available for QC partners rather than Google (N5X/ 6P)