LoongArch: Add relaxation support for call36 that jump to PLT entry

Part of commit a104f0a3e620 ("LoongArch: Add more relaxation support for
call36") in master.  This part is needed for 2.43 branch to fix a link
failure of QtWebEngine-6.8.1, which can be demonstrated with a reduced
test case (with -shared):

    .text
    .zero 1 << 27   # pretending we have a lot of code in .text
    .globl f        # preemptible, thus must be called via PLT
    f:
      move $a0, $r0
      ret
    g:
      pcaddu18i $t0, %call36(f)
      jr $t0

Signed-off-by: Xi Ruoyao <xry111@xry111.site>

bfd/elfnn-loongarch.c

@@ -5325,8 +5325,8 @@ loongarch_elf_relax_section (bfd *abfd, asection *sec,
   for (unsigned int i = 0; i < sec->reloc_count; i++)
     {
       char symtype;
-      bfd_vma symval;
+      bfd_vma symval = 0; /* "= 0" for https://gcc.gnu.org/PR118216 */
-      asection *sym_sec;
+      asection *sym_sec = NULL;
       bool local_got = false;
       Elf_Internal_Rela *rel = relocs + i;
       struct elf_link_hash_entry *h = NULL;
@@ -5410,6 +5410,11 @@ loongarch_elf_relax_section (bfd *abfd, asection *sec,
 		    && GOT_TLS_GD_BOTH_P (tls_type))
 		symval += 2 * GOT_ENTRY_SIZE;
 	    }
+	  else if (h->plt.offset != MINUS_ONE)
+	    {
+	      sym_sec = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
+	      symval = h->plt.offset;
+	    }
 	  else if ((h->root.type == bfd_link_hash_defined
 		  || h->root.type == bfd_link_hash_defweak)
 		&& h->root.u.def.section != NULL
@@ -5418,14 +5423,33 @@ loongarch_elf_relax_section (bfd *abfd, asection *sec,
 	      symval = h->root.u.def.value;
 	      sym_sec = h->root.u.def.section;
 	    }
-	  else
-	    continue;
 
 	  if (h && LARCH_REF_LOCAL (info, h))
 	    local_got = true;
 	  symtype = h->type;
 	}
 
+      /* If the conditions for tls type transition are met, type
+	 transition is performed instead of relax.
+	 During the transition from DESC->IE/LE, there are 2 situations
+	 depending on the different configurations of the relax/norelax
+	 option.
+	 If the -relax option is used, the extra nops will be removed,
+	 and this transition is performed in pass 0.
+	 If the --no-relax option is used, nop will be retained, and
+	 this transition is performed in pass 1.  */
+      if (IS_LOONGARCH_TLS_TRANS_RELOC (r_type)
+	  && (i + 1 != sec->reloc_count)
+	  && ELFNN_R_TYPE (rel[1].r_info) == R_LARCH_RELAX
+	  && loongarch_can_trans_tls (abfd, info, h, r_symndx, r_type))
+	{
+	  loongarch_tls_perform_trans (abfd, sec, rel, h, info);
+	  r_type = ELFNN_R_TYPE (rel->r_info);
+	}
+
+      if (!sym_sec)
+	continue;
+
       if (sym_sec->sec_info_type == SEC_INFO_TYPE_MERGE
 	   && (sym_sec->flags & SEC_MERGE))
 	{
@@ -5453,24 +5477,6 @@ loongarch_elf_relax_section (bfd *abfd, asection *sec,
 
       symval += sec_addr (sym_sec);
 
-      /* If the conditions for tls type transition are met, type
-	 transition is performed instead of relax.
-	 During the transition from DESC->IE/LE, there are 2 situations
-	 depending on the different configurations of the relax/norelax
-	 option.
-	 If the -relax option is used, the extra nops will be removed,
-	 and this transition is performed in pass 0.
-	 If the --no-relax option is used, nop will be retained, and
-	 this transition is performed in pass 1.  */
-      if (IS_LOONGARCH_TLS_TRANS_RELOC (r_type)
-	  && (i + 1 != sec->reloc_count)
-	  && ELFNN_R_TYPE (rel[1].r_info) == R_LARCH_RELAX
-	  && loongarch_can_trans_tls (abfd, info, h, r_symndx, r_type))
-	{
-	  loongarch_tls_perform_trans (abfd, sec, rel, h, info);
-	  r_type = ELFNN_R_TYPE (rel->r_info);
-	}
-
       switch (r_type)
 	{
 	case R_LARCH_ALIGN:

bfd/version.h

@@ -16,7 +16,7 @@
 
    In releases, the date is not included in either version strings or
    sonames.  */
-#define BFD_VERSION_DATE 20241222
+#define BFD_VERSION_DATE 20241230
 #define BFD_VERSION @bfd_version@
 #define BFD_VERSION_STRING  @bfd_version_package@ @bfd_version_string@
 #define REPORT_BUGS_TO @report_bugs_to@