Add UUIDs to counter descriptors to allow uniquely identifiying them.

For built-in types, use a hard-coded GUID and just modify the last 32-bits; for the AMD counters, we just hash the description/name for now.

renderdoc/driver/vulkan/vk_counters.cpp

@@ -77,6 +77,11 @@ vector<GPUCounter> VulkanReplay::EnumerateCounters()
 void VulkanReplay::DescribeCounter(GPUCounter counterID, CounterDescription &desc)
 {
   desc.counterID = counterID;
+  // 6839CB5B-FBD2-4550-B606-8C65157C684C
+  desc.uuid.bytes[0] = 0x6839CB5B;
+  desc.uuid.bytes[1] = 0xFBD24550;
+  desc.uuid.bytes[2] = 0xB6068C65;
+  desc.uuid.bytes[3] = 0x157C684C ^ (uint32_t)counterID;
 
   switch(counterID)
   {