Unrevert most of regexp reentrancy abort patch

The problem was in:
  * src/syntax.c (update_syntax_table_forward): Propertize even when truncated
which is hence not unreverted.
The rest is:
* src/syntax.h (UPDATE_SYNTAX_TABLE_FORWARD_FAST):
(UPDATE_SYNTAX_TABLE_FAST): Re-introduce.
All callers in regex.c changed back to the _FAST versions.

* test/automated/message-mode-tests.el: Tweak the test to rely on auto
propertization in backward-sexp.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/syntax.h b/src/syntax.h
index 06ce0ec55df..eb154e088c9 100644
--- a/src/syntax.h
+++ b/src/syntax.h
@@ -186,6 +186,13 @@ UPDATE_SYNTAX_TABLE_FORWARD (ptrdiff_t charpos)
                                  false, gl_state.object);
 }
 
+INLINE void
+UPDATE_SYNTAX_TABLE_FORWARD_FAST (ptrdiff_t charpos)
+{
+  if (parse_sexp_lookup_properties && charpos >= gl_state.e_property)
+    update_syntax_table (charpos + gl_state.offset, 1, false, gl_state.object);
+}
+
 /* Make syntax table state (gl_state) good for CHARPOS, assuming it is
    currently good for a position after CHARPOS.  */
 
@@ -205,6 +212,13 @@ UPDATE_SYNTAX_TABLE (ptrdiff_t charpos)
   UPDATE_SYNTAX_TABLE_FORWARD (charpos);
 }
 
+INLINE void
+UPDATE_SYNTAX_TABLE_FAST (ptrdiff_t charpos)
+{
+  UPDATE_SYNTAX_TABLE_BACKWARD (charpos);
+  UPDATE_SYNTAX_TABLE_FORWARD_FAST (charpos);
+}
+
 /* Set up the buffer-global syntax table.  */
 
 INLINE void