[llvm] [orc-rt] Ensure EH/RTTI=On overrides LLVM opts, applies to unit tests. (PR #172155)

[Jared Wyles via llvm-commits]

================
@@ -39,4 +39,5 @@ add_orc_rt_unittest(CoreTests
   span-test.cpp
   DISABLE_LLVM_LINK_LLVM_DYLIB
   )
+target_compile_options(CoreTests PRIVATE ${ORC_RT_COMPILE_FLAGS})
----------------
jaredwy wrote:

```
)
+set_target_properties(CoreTests PROPERTIES
+  CXX_RTTI ${ORC_RT_ENABLE_RTTI}
+  CXX_EXCEPTIONS ${ORC_RT_ENABLE_EXCEPTIONS}
+)
```
something like this would work, but you would also need to ensure its on the executor etc 

https://github.com/llvm/llvm-project/pull/172155