[llvm] [SPIR-V] Add SPIRV to LLVM_ALL_TARGETS (PR #119653)

[Renato Golin via llvm-commits]

rengolin wrote:

Leaving here the same comment I left on the forum: I support this move, given the back-end has been fulfilling the criteria for years now.

It would be good to merge this _before_ the next release branch, so that production tools that rely on it could pick the next version easily.

So, LGTM, but I'll wait to approve, to let others have time to digest this.

https://github.com/llvm/llvm-project/pull/119653