[libunwind] [libunwind] introduce _LIBUNWIND_TRACE_DWARF_EVAL for increased baremetal friendliness (PR #72040)

[Michael Kenzel via cfe-commits]

================
@@ -223,6 +223,21 @@
     } while (0)
 #endif
 
+#define _LIBUNWIND_TRACING_DWARF_EVAL (0)
----------------
michael-kenzel wrote:

In fact, since this is more some kind of internal feature, maybe it shouldn't be in the config header at all but rather just defined and undef'ed again inside the original function? Though having all the stuff to do with logging defined in a similar fashion in one place is probably preferable…

https://github.com/llvm/llvm-project/pull/72040