This just fixes the PR number in the ChangeLog. Nothing we can do about the SVN history.
gcc/ChangeLog Committed as obvious.
Index: ChangeLog =================================================================== --- ChangeLog (revision 263357) +++ ChangeLog (working copy) @@ -9,7 +9,7 @@ 2018-08-06 John David Anglin <dang...@gcc.gnu.org> - PR target/86807 + PR target/86785 * config/pa/pa.c (TARGET_HAVE_SPECULATION_SAFE_VALUE): Define to speculation_safe_value_not_needed.