[PATCH] cfgrtl: Fix up -g vs. -g0 code generation -flto differences in fixup_reorder_chain [PR104589]

[Jakub Jelinek via Gcc-patches]

Hi!

This is similar to PR104237 and similarly to that, no testcase included
for the testsuite, as we don't have a framework to compile/link with
-g -flto and -g0 -flto and compare -fdump-final-insns= results from
the lto1 compilations.

With -flto, whether two location_t compare equal or not and just
express the same location is a lottery.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux,
ok for trunk?

2022-03-02  Jakub Jelinek  <ja...@redhat.com>

        PR rtl-optimization/104589
        * cfgrtl.cc (fixup_reorder_chain): Use loc_equal instead of direct
        INSN_LOCATION comparison with goto_locus.

--- gcc/cfgrtl.cc.jj    2022-02-04 14:36:54.068618386 +0100
+++ gcc/cfgrtl.cc       2022-03-01 16:11:06.307419636 +0100
@@ -4090,7 +4090,7 @@ fixup_reorder_chain (void)
                     && (!NONDEBUG_INSN_P (insn) || !INSN_HAS_LOCATION (insn)))
                insn = PREV_INSN (insn);
              if (insn != end
-                 && INSN_LOCATION (insn) == e->goto_locus)
+                 && loc_equal (INSN_LOCATION (insn), e->goto_locus))
                continue;
              if (simplejump_p (BB_END (e->src))
                  && !INSN_HAS_LOCATION (BB_END (e->src)))
@@ -4112,7 +4112,7 @@ fixup_reorder_chain (void)
                  while (insn != end && !NONDEBUG_INSN_P (insn))
                    insn = NEXT_INSN (insn);
                  if (insn != end && INSN_HAS_LOCATION (insn)
-                     && INSN_LOCATION (insn) == e->goto_locus)
+                     && loc_equal (INSN_LOCATION (insn), e->goto_locus))
                    continue;
                }
              nb = split_edge (e);

        Jakub