[llvm] [Option] Add Condition for build-conditional library options (PR #230898)

[Alexis Engelke via llvm-commits]

aengelke wrote:

Options guarded behind LLVM_ENABLE_DUMP seem misguided, that macro should only control the existence of dump() methods when assertions are off (cf. CMakeLists.txt). Let's reduce this to debug-only then?

https://github.com/llvm/llvm-project/pull/230898