[clang] [lldb] [llvm] [cmake] Build executables with -no_exported_symbols when building Apple toolchain (PR #87684)

[Slava Zakharin via llvm-commits]

vzakhari wrote:

FYI, it looks like this change broke `compiler-rt` build, e.g. in https://lab.llvm.org/buildbot/#/builders/270/builds/12485

https://github.com/llvm/llvm-project/pull/87684