LTO: Handle __real_SYM reference in IR

When an IR symbol SYM is referenced in IR via __real_SYM, its resolution
should be LDPR_PREVAILING_DEF, not PREVAILING_DEF_IRONLY, since LTO
doesn't know that __real_SYM should be resolved by SYM.

bfd/

	PR ld/29086
	* linker.c (bfd_wrapped_link_hash_lookup): Mark SYM is referenced
	via __real_SYM.

include/

	PR ld/29086
	* bfdlink.h (bfd_link_hash_entry): Add ref_real.

ld/

	PR ld/29086
	* plugin.c (get_symbols): Resolve SYM definition to
	LDPR_PREVAILING_DEF for __real_SYM reference.
	* testsuite/ld-plugin/lto.exp: Run PR ld/29086 test.
	* testsuite/ld-plugin/pr29086.c: New file.

2 files changed, 27 insertions, 0 deletions

diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp
index f4ea1d4..4e8e2dc 100644
--- a/ld/testsuite/ld-plugin/lto.exp
+++ b/ld/testsuite/ld-plugin/lto.exp
@@ -522,6 +522,14 @@ set lto_link_elf_tests [list \
    {{"nm" {-D} "pr28849.d"}} \
    "pr28849" \
   ] \
+  [list \
+   "PR ld/pr29086" \
+   "-Wl,--wrap=foo" \
+   "-O0 -flto" \
+   {pr29086.c} \
+   {} \
+   "pr29086" \
+  ] \
 ]
 
 # PR 14918 checks that libgcc is not spuriously included in a shared link of
diff --git a/ld/testsuite/ld-plugin/pr29086.c b/ld/testsuite/ld-plugin/pr29086.c
new file mode 100644
index 0000000..d333d68
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr29086.c
@@ -0,0 +1,19 @@
+int
+foo (void)
+{
+  return 0;
+}
+
+int
+main ()
+{
+  return foo ();
+}
+
+extern int __real_foo (void);
+
+int
+__wrap_foo (void)
+{
+  return __real_foo ();
+}