ld: Set non_ir_ref_regular on source for assignment

We need to set non_ir_ref_regular on the source for assignment to get
the correct LTO resolution:

190 a27be7f4ad90c5ce PREVAILING_DEF real_g

instead of

190 30c3b2d8f967f5ea PREVAILING_DEF_IRONLY real_g

	PR ld/26163
	* ldexp.c (exp_fold_tree_1): Set non_ir_ref_regular on the source
	for assignment.
	* testsuite/ld-plugin/lto.exp: Run ld/26163 test.
	* testsuite/ld-plugin/pr26163a.c: New file.
	* testsuite/ld-plugin/pr26163b.c: Likewise.

3 files changed, 36 insertions, 0 deletions

diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp
index a7b9cac..5a6ba7a 100644
--- a/ld/testsuite/ld-plugin/lto.exp
+++ b/ld/testsuite/ld-plugin/lto.exp
@@ -207,6 +207,9 @@ set lto_link_tests [list \
   [list "Build pr24406-2b.o" \
    "" "-O2 -fno-lto" \
    {pr24406-2b.c}] \
+  [list "Build pr26163a.o" \
+   "" "-O2 -fno-lto" \
+   {pr26163a.c}] \
 ]
 
 if { [at_least_gcc_version 10 0] } {
@@ -502,6 +505,11 @@ set lto_run_tests [list \
    {pr24406-2a.c} "pr24406-2" "pass.out" \
    "-flto -O2" "c" "" \
    "tmpdir/pr24406-2b.o -Wl,--wrap=cook"] \
+  [list "Run pr26163" \
+   "-O2 -flto" "" \
+   {pr26163b.c} "pr24406-2" "pass.out" \
+   "-flto -O2" "c" "" \
+   "tmpdir/pr26163a.o -Wl,--defsym,g=real_g"] \
 ]
 
 if { [at_least_gcc_version 4 7] } {
diff --git a/ld/testsuite/ld-plugin/pr26163a.c b/ld/testsuite/ld-plugin/pr26163a.c
new file mode 100644
index 0000000..4c9979b
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr26163a.c
@@ -0,0 +1,9 @@
+extern int counter;
+
+extern void g(void);
+
+void f(void)
+{
+  g();
+  counter++;
+}
diff --git a/ld/testsuite/ld-plugin/pr26163b.c b/ld/testsuite/ld-plugin/pr26163b.c
new file mode 100644
index 0000000..5524b4e
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr26163b.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+int counter;
+extern void f(void);
+
+void
+real_g(void)
+{
+  counter++;
+}
+
+int main()
+{
+  real_g();
+  f();
+  if (counter == 3)
+    printf ("PASS\n");
+  return 0;
+}