update build infrastructure for llvm-16.0.6

Update build infrastructure for LLVM 13.0.0.

Update clang build infrastructure for LLVM 11.1.0.

Heavy lifting by mortimer@, thank you so much!

Update build infrastructure for LLVM 10.0.1.

Update build infrastructure for LLVM 10.0.0.

ok hackroom@
tested by plenty

Update clang build infrastructure for LLVM 8.0.1.

Update clang build infrastructure for LLVM 8.0.0.

Correct LLVM backend version.

From Brad

Update clang build infrastructure for LLVM 7.0.1.

Update clang build infrastructure for LLVM 6.0.0.

Update to LLVM 5.0.1 which apparently includes plenty of bugfixes.

Requested by Brad
Tested by me on amd64
Tested by bluhm on i386
Tested by kettenis on arm64, armv7 and sparc64

Update clang build infrastructure for LLVM 5.0.0.

Update clang build infrastructure for LLVM 4.0.0

Discussed with kettenis@

Update clang build infrastructure for LLVM 3.9.1

"go ahead" kettenis@
"just go ahead" deraadt@
"sounds good to me" stefan@

LLVM/Clang build system. This only builds the bare minimum of what is needed
to get a working "clang" binary.

Note that you need GCC from ports to bootstrap clang.

looks good to patrick@, ok jsg@

LLVM/Clang build system. This only builds the bare minimum of what is needed
to get a working "clang" binary.

Note that you need GCC from ports to bootstrap clang.

looks good to patrick@, ok jsg@ kettenis@

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