revert the lineno pointer back to the string start

Author: isidentical

Lib/test/test_exceptions.py

@@ -238,7 +238,7 @@ def bar():
 
             def baz():
                 '''quux'''
-            """, 9, 20)
+            """, 9, 24)
         check("pass\npass\npass\n(1+)\npass\npass\npass", 4, 4)
         check("(1+)", 1, 4)
 

Parser/tokenizer.c

@@ -1743,6 +1743,7 @@ tok_get(struct tok_state *tok, const char **p_start, const char **p_end)
                 tok->cur = (char *)tok->start;
                 tok->cur++;
                 tok->line_start = tok->multi_line_start;
+                tok->lineno = tok->first_lineno;
                 if (quote_size == 3) {
                     return syntaxerror(tok,
                            "unterminated triple-quoted string literal");