[lld] [ELF] Respect orders of symbol assignments and DEFINED (PR #65866)

[Ben Shi via llvm-commits]

benshi001 wrote:

LGTM. Would it be better to add a link to the GNU-ld's AVR default linker script, in your commit message ?

https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=ld/scripttempl/avr.sc;hb=HEAD
 

https://github.com/llvm/llvm-project/pull/65866