[llvm] [cmake] LLVM_BUILTINS_TARGET='default' should bootstrap builtins without compiler-rt (PR #171536)

[Petr Hosek via llvm-commits]

================
@@ -34,6 +34,13 @@ function(get_compiler_rt_path path)
       return()
     endif()
   endforeach()
+
+  # If LLVM_BUILTIN_TARGETS is spcified, we still need
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petrhosek wrote:

```suggestion
  # If LLVM_BUILTIN_TARGETS is specified, we still need
```

https://github.com/llvm/llvm-project/pull/171536