Add builtin symbols

boot/definitions.inc

@@ -2,6 +2,10 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
+#
+# Tokens.
+#
+
 # The constant should match the index in the keywords array in tokenizer.s.
 
 .equ TOKEN_PROGRAM, 1
@@ -52,3 +56,8 @@
 
 .equ TOKEN_ASSIGN, 43
 .equ TOKEN_INTEGER, 44
+
+#
+# Symbols.
+#
+.equ TYPE_PRIMITIVE, 1