4987 - support `browse_trace` tool in SubX

I've extracted it into a separate binary, independent of my Mu prototype.

I also cleaned up my tracing layer to be a little nicer. Major improvements:

- Realized that incremental tracing really ought to be the default.
  And to minimize printing traces to screen.

- Finally figured out how to combine layers and call stack frames in a
  single dimension of depth. The answer: optimize for the experience of
  `browse_trace`. Instructions occupy a range of depths based on their call
  stack frame, and minor details of an instruction lie one level deeper
  in each case.

Other than that, I spent some time adjusting levels everywhere to make
`browse_trace` useful.

1 files changed, 1 insertions, 1 deletions

diff --git a/subx/036global_variables.cc b/subx/036global_variables.cc
index 78824262..2d20ca43 100644
--- a/subx/036global_variables.cc
+++ b/subx/036global_variables.cc
@@ -18,7 +18,7 @@ x:
 Transform.push_back(rewrite_global_variables);
 :(code)
 void rewrite_global_variables(program& p) {
-  trace(99, "transform") << "-- rewrite global variables" << end();
+  trace(3, "transform") << "-- rewrite global variables" << end();
   // Begin rewrite_global_variables
   map<string, uint32_t> address;
   compute_addresses_for_global_variables(p, address);