support 'LL' integer suffix without 'u'

src/parser/parser.cc

@@ -211,6 +211,7 @@ static const char * builtin_types[] = {
     "__float80",
     "__ibm128",
     "_Complex",
+    "__m64",
 };
 
 bool is_type_name(const std::string & type_name)

src/parser/parser.l

@@ -141,7 +141,7 @@ L?'\\t'             (void)'\t'; return CHAR_CONST;
 L?'\\v'             (void)'\v'; return CHAR_CONST;
 L?'\\x[0-9A-Fa-f]{2}'   return CHAR_CONST;
 L?'\\[0-7]{1,3}'        return CHAR_CONST;
-[0-9]+([uU][lL]?[lL]?)?              return INT_CONST;
+[0-9]+[uU]?[lL]?[lL]?                return INT_CONST;
 0[xX][0-9a-fA-F]+([uU][lL]?[lL]?)?   return INT_CONST;
 ([0-9]+\.[0-9]*|\.[0-9]+)([eE][-+]?[0-9]+)?[fFlL]?     return FLOAT_CONST;