Don't free dominators after sincos

[Richard Sandiford]

sincos has always freed dominators at the end, but AFAICT they should
still be up-to-date.  (In particular, gimple_purge_dead_eh_edges
updates the information.)

Tested on x86_64-linux-gnu, arm-linux-gnueabi and aarch64-linux-gnu.
OK to install?

Thanks,
Richard


gcc/
        * tree-ssa-math-opts.c (pass_cse_sincos::execute): Don't free
        CDI_DOMINATORS.

diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c
index 2080328..1802754 100644
--- a/gcc/tree-ssa-math-opts.c
+++ b/gcc/tree-ssa-math-opts.c
@@ -1857,7 +1857,6 @@ pass_cse_sincos::execute (function *fun)
   statistics_counter_event (fun, "sincos statements inserted",
                            sincos_stats.inserted);
 
-  free_dominance_info (CDI_DOMINATORS);
   return cfg_changed ? TODO_cleanup_cfg : 0;
 }