[Bug 284297] [exp-run] update LLVM_DEFAULT to 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284297

Dimitry Andric <dim@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |brooks@FreeBSD.org

--- Comment #7 from Dimitry Andric <dim@FreeBSD.org> ---
(In reply to Antoine Brodin from comment #3)
The mesa-related failures on i386 are due to:

  llvm-config found: YES (/usr/local/bin/llvm-config19) 19.1.7
  Run-time dependency LLVM (modules: amdgpu(missing), asmparser, bitreader,
bitwriter, core, coverage, engine, executionengine, instcombine, ipo, irreader,
libdriver, linker, lto, mcdisassembler, mcjit, native, option, scalaropts,
target, transformutils, all-targets, coroutines, frontenddriver, frontendhlsl,
lto, windowsdriver) found: NO (tried config-tool)

This affects at least:
* graphics/mesa-dri
* graphics/mesa-gallium-va
* graphics/mesa-gallium-vdpau
* lang/clover

It is because on i386 the AMDGPU backend isn't built by default for
devel/llvm19. It looks like Brooks did this to save a bit of build time, and it
is not very likely that i386 users are going to run a full-blown X server.
(Although, you can never be sure :)

If we can turn on this backend again for i386, I assume that quite a few
failures will go away.

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