ReleaseNotes: add lld/ELF notes (#80393)

lld/docs/ReleaseNotes.rst

@@ -29,8 +29,50 @@ ELF Improvements
 * ``--fat-lto-objects`` option is added to support LLVM FatLTO.
   Without ``--fat-lto-objects``, LLD will link LLVM FatLTO objects using the
   relocatable object file. (`D146778 <https://reviews.llvm.org/D146778>`_)
+* ``-Bsymbolic-non-weak`` is added to directly bind non-weak definitions.
+  (`D158322 <https://reviews.llvm.org/D158322>`_)
+* ``--lto-validate-all-vtables-have-type-infos``, which complements
+  ``--lto-whole-program-visibility``, is added to disable unsafe whole-program
+  devirtualization. ``--lto-known-safe-vtables=<glob>`` can be used
+  to mark known-safe vtable symbols.
+  (`D155659 <https://reviews.llvm.org/D155659>`_)
+* ``--save-temps --lto-emit-asm`` now derives ELF/asm file names from bitcode file names.
+  ``ld.lld --save-temps a.o d/b.o -o out`` will create ELF relocatable files
+  ``out.lto.a.o``/``d/out.lto.b.o`` instead of ``out1.lto.o``/``out2.lto.o``.
+  (`#78835 <https://github.com/llvm/llvm-project/pull/78835>`_)
+* ``--no-allow-shlib-undefined`` now reports errors for DSO referencing
+  non-exported definitions.
+  (`#70769 <https://github.com/llvm/llvm-project/pull/70769>`_)
 * common-page-size can now be larger than the system page-size.
   (`#57618 <https://github.com/llvm/llvm-project/issues/57618>`_)
+* When call graph profile information is available due to instrumentation or
+  sample PGO, input sections are now sorted using the new ``cdsort`` algorithm,
+  better than the previous ``hfsort`` algorithm.
+  (`D152840 <https://reviews.llvm.org/D152840>`_)
+* Symbol assignments like ``a = DEFINED(a) ? a : 0;`` are now handled.
+  (`#65866 <https://github.com/llvm/llvm-project/pull/65866>`_)
+* ``OVERLAY`` now supports optional start address and LMA
+  (`#77272 <https://github.com/llvm/llvm-project/pull/77272>`_)
+* Relocations referencing a symbol defined in ``/DISCARD/`` section now lead to
+  an error.
+  (`#69295 <https://github.com/llvm/llvm-project/pull/69295>`_)
+* For AArch64 MTE, global variable descriptors have been implemented.
+  (`D152921 <https://reviews.llvm.org/D152921>`_)
+* ``R_AARCH64_GOTPCREL32`` is now supported.
+  (`#72584 <https://github.com/llvm/llvm-project/pull/72584>`_)
+* ``R_LARCH_PCREL20_S2``/``R_LARCH_ADD6``/``R_LARCH_CALL36`` and extreme code
+  model relocations are now supported.
+* ``--emit-relocs`` is now supported for RISC-V linker relaxation.
+  (`D159082 <https://reviews.llvm.org/D159082>`_)
+* Call relaxation respects RVC when mixing +c and -c relocatable files.
+  (`#73977 <https://github.com/llvm/llvm-project/pull/73977>`_)
+* ``R_RISCV_GOT32_PCREL`` is now supported.
+  (`#72587 <https://github.com/llvm/llvm-project/pull/72587>`_)
+* ``R_RISCV_SET_ULEB128``/``R_RISCV_SUB_ULEB128`` relocations are now supported.
+  (`#72610 <https://github.com/llvm/llvm-project/pull/72610>`_)
+  (`#77261 <https://github.com/llvm/llvm-project/pull/77261>`_)
+* RISC-V TLSDESC is now supported.
+  (`#79239 <https://github.com/llvm/llvm-project/pull/79239>`_)
 
 Breaking changes
 ----------------