rename lld to lld19 ( with provides=lld ), add lld20, restore lld18

beginning of a new era for lld

assigned to @ncopa

mentioned in merge request !81782 (merged)

added 160 commits

• 485b98a5...38808aaa - 157 commits from branch alpine:master
• 5c457127 - main/lld19: rename from lld
• 9524dd78 - main/lld20: new aport
• 42054290 - community/lld18: restore

Compare with previous version

resolved all threads

added 8 commits

• 42054290...3c1197d5 - 4 commits from branch alpine:master
• b7118bfe - main/lld19: rename from lld
• d7baa327 - main/lld20: new aport
• 8a32dba3 - community/lld18: restore
• 6feee6ae - community/lld18: disable check on x86

Compare with previous version

merged