delete mode 100644 doc/langref/builtin.CallModifier struct.zig
 create mode 100644 doc/langref/lang.CallModifier struct.zig
 delete mode 100644 lib/std/builtin.zig
 delete mode 100644 lib/std/builtin/assembly.zig
 create mode 100644 lib/std/lang.zig
 create mode 100644 lib/std/lang/assembly.zig