Add byte slice type

ql/src/semmle/go/Types.qll

@@ -328,6 +328,11 @@ class SliceType extends @slicetype, CompositeType {
   override string toString() { result = "slice type" }
 }
 
+/** A byte slice type */
+class ByteSliceType extends SliceType {
+  ByteSliceType() { this.getElementType() instanceof Uint8Type }
+}
+
 /** A struct type. */
 class StructType extends @structtype, CompositeType {
   /**

ql/src/semmle/go/security/XPathInjectionCustomizations.qll

@@ -39,12 +39,6 @@ module XPathInjection {
     XPathExpressionStringAsSink() { this instanceof XPath::XPathExpressionString::Range }
   }
 
-  // TODO: This probably belongs somewhere, but I'm not sure where
-  /** The []byte type */
-  class ByteSliceType extends SliceType {
-    ByteSliceType() { this.getElementType() instanceof Uint8Type }
-  }
-
   //TODO add runes?
   /**
    * A call to `filepath.Rel`, considered as a sanitizer for path traversal.