CPP:Make __is_trivial a builtin operation.

Author: Alex Eyers-Taylor

cpp/downgrades/dbe9c8eb5fc6f54b7ae08c7317d0795b24961564/old.dbscheme

@@ -0,0 +1,2 @@
+description: Make __is_trivial a builtin operation
+compatibility: full

cpp/downgrades/dbe9c8eb5fc6f54b7ae08c7317d0795b24961564/semmlecode.cpp.dbscheme

@@ -1547,3 +1547,21 @@ class BuiltInBitCast extends BuiltInOperation, @builtinbitcast {
 
   override string getAPrimaryQlClass() { result = "BuiltInBitCast" }
 }
+
+/**
+ * A C++ `__is_trivial` built-in operation (used by some implementations of the
+ * `<type_traits>` header).
+ *
+ * Returns `true` if a type is a trivial type.
+ * ```
+ *  template<typename _Tp>
+ *    struct is_trivial
+ *    : public integral_constant<bool, __is_trivial(_Tp)>
+ *    {};
+ * ```
+ */
+class BuiltInIsTrivial extends BuiltInOperation, @istrivialexpr {
+  override string toString() { result = "__is_trivial" }
+
+  override string getAPrimaryQlClass() { result = "BuiltInIsTrivial" }
+}

cpp/downgrades/dbe9c8eb5fc6f54b7ae08c7317d0795b24961564/upgrade.properties

@@ -1755,6 +1755,7 @@ case @expr.kind of
             | @istriviallydestructibleexpr
             | @istriviallyassignableexpr
             | @isnothrowassignableexpr
+            | @istrivialexpr
             | @isstandardlayoutexpr
             | @istriviallycopyableexpr
             | @isliteraltypeexpr