[gcc(refs/users/aoliva/heads/hardcond)] enable hardening of conditionals for testing

[Alexandre Oliva]

https://gcc.gnu.org/g:aeda5e8722efcd58b4ab9059b4973059f54e2349

commit aeda5e8722efcd58b4ab9059b4973059f54e2349
Author: Alexandre Oliva <oliva@gnu.org>
Date:   Tue Oct 19 04:51:00 2021 -0300

    enable hardening of conditionals for testing

Diff:
---
 gcc/common.opt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/common.opt b/gcc/common.opt
index 7144755f66d..c88f0b6f263 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1722,12 +1722,14 @@ fguess-branch-probability
 Common Var(flag_guess_branch_prob) Optimization
 Enable guessing of branch probabilities.
 
+; ??? Do NOT enable by default
 fharden-compares
-Common Var(flag_harden_compares) Optimization
+Common Var(flag_harden_compares) Optimization Init(1)
 Harden conditionals not used in branches, checking reversed conditions.
 
+; ??? Do NOT enable by default
 fharden-conditional-branches
-Common Var(flag_harden_conditional_branches) Optimization
+Common Var(flag_harden_conditional_branches) Optimization Init(1)
 Harden conditional branches by checking reversed conditions.
 
 ; Nonzero means ignore `#ident' directives.  0 means handle them.