[Bug 239682] Default to devel/llvm90 when libLLVM/libclang are required or if /usr/bin/clang is not enough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239682

--- Comment #8 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Gleb Popov from comment #7)
> much easier to fix KLEE dependency to llvm80 instead of LLVM_DEFAULT.

The patch in review D21172 already does. Unless the port supports only one LLVM
version (e.g., llvm80 but not llvm70, llvm60) then using LLVM_DEFAULT is kinda
OK if you're willing to support.

If we do end up with USES=llvm it'd be nice to have something more than version
range checks. Alternatively, library support (e.g., libclang from devel/llvm*,
libatomic from lang/gcc*) can be added into USES=compiler after throwing out
unused cruft.

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