[llvm-branch-commits] [llvm] Backport '[CMake] Update "all" project/runtimes (#179270)' to 22.x (PR #182090)

[Calvin Owens via llvm-branch-commits]

jcalvinowens wrote:

@nikic using `-DLLVM_ENABLE_PROJECTS=all -DLLVM_ENABLE_RUNTIMES=all` has always worked in the past, but fails starting with 22.x. This patch fixes it.

I originally misunderstood the issue as being because compiler-rt showed up in both, but it's actually that compiler-rt shows up in PROJECTS with anything at all in RUNTIMES.

https://github.com/llvm/llvm-project/pull/182090