Add a few release notes

[ruiu]

Thanks. I'm writing release notes too, so I'll merge it with yours. Please just submit yours now and I'll edit it further.

[• espindola]

r325811

[mstorsjo]

docs/ReleaseNotes.rst

30

Minor typo - shouldn't this be "thunks for out of range branches/jumps"?

docs/ReleaseNotes.rst

 ----------------
 
 * MIPS port now generates all output dynamic relocations
   using Elf_Rel format only.
 
 * Added handling of the R_MIPS_26 relocation in case of N32 / N64 ABIs
   and generating proper PLT entries.
 
+* lld can patch Aarch64 errata 843419.
+
+* lld can generate thunks for out of range thunks.
+
+* ARM PLT entries automatically use short or long variants.
+
+* Lots of bug fixes. Should be able to handle almost all linker and version scripts.
+
+* Faster gdb index creation.
+
+* Tar files created by --reproduce now work even in the presence of absolute paths.
+
+* lld defaults to --hash-style=both.
+
+* ICF now deduplicates .eh_frame entries.
+
+* LLD supports the Android relocation packing format.
+
+* Debug info is used in more cases when reporting errors.
+
+* LLD can produce x86/x86_64 PLTs that use retpolines.
+
 COFF Improvements
 -----------------
 
 * A GNU ld style frontend for the COFF linker has been added for MinGW.
   In MinGW environments, the linker is invoked with GNU ld style parameters;
   which LLD previously only supported when used as an ELF linker. When
   a PE/COFF target is chosen, those parameters are rewritten into the
   lld-link style parameters and the COFF linker is invoked instead.