Vendor Microsoft/go-winio@v0.4.12

Signed-off-by: John Howard <jhoward@microsoft.com>

vendor/github.com/Microsoft/go-winio/internal/etw/eventdatadescriptor.go

@@ -0,0 +1,29 @@
+package etw
+
+import (
+	"unsafe"
+)
+
+type eventDataDescriptorType uint8
+
+const (
+	eventDataDescriptorTypeUserData eventDataDescriptorType = iota
+	eventDataDescriptorTypeEventMetadata
+	eventDataDescriptorTypeProviderMetadata
+)
+
+type eventDataDescriptor struct {
+	ptr       ptr64
+	size      uint32
+	dataType  eventDataDescriptorType
+	reserved1 uint8
+	reserved2 uint16
+}
+
+func newEventDataDescriptor(dataType eventDataDescriptorType, buffer []byte) eventDataDescriptor {
+	return eventDataDescriptor{
+		ptr:      ptr64{ptr: unsafe.Pointer(&buffer[0])},
+		size:     uint32(len(buffer)),
+		dataType: dataType,
+	}
+}