merge lld-16.0.6

document NOBTCFI similar to WXNEEDED

default sparc64 ld.lld to --execute-only
Note this doesn't actually work yet for anything big -- some unknown
stuff needs to be fixed. Also ld.lld isn't the default sparc64 ld yet.
But at least havi

default sparc64 ld.lld to --execute-only
Note this doesn't actually work yet for anything big -- some unknown
stuff needs to be fixed. Also ld.lld isn't the default sparc64 ld yet.
But at least having this available during normal builds, to test iterate
upon, will speed up either of those desireable outcomes.
ok claudio

show more ...

make --execute-only the default on powerpc
ok gkoehler

sync --execute-only archs described in the manual with current code
ok deraadt

enable --exec-only as default on AMD64. There will be a some ports fallout
for a little while more (a few more data tables inside text), but they are
being handled quickly
ok tb naddy

Update the list of architectures where clang will accept the
--execute-only option, and also indicate which ones have enabled by
default now (in our naming convention, that is arm64 and riscv64)

arm64 and riscv64 can now do --execute-only by default
ok kettenis

lld: restore upstream default for --[no-]allow-shlib-undefined

ok patrick@ kettenis@

Merge LLVM 13.0.0.

Import LLVM 13.0.0 release.

Import LLVM 11.1.0 release including clang, lld and lldb.

Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty