message: Disable `InsertSourceBlocksPass` when not instrumenting
  Summary: Avoid the overhead.
diff: #include "ScopedCFG.h"
  #include "Show.h"
  #include "SourceBlocks.h"
  +#include "Trace.h"
  #include "Walkers.h"
  using namespace cfg;
  @@ -82,6 +83,13 @@ void InsertSourceBlocksPass::bind_config() {
  void InsertSourceBlocksPass::run_pass(DexStoresVector& stores,
  ConfigFiles& conf,
  PassManager& mgr) {
  + // TODO(agampe): This should eventually go away. For now, avoid the overhead.
  + if (!mgr.get_redex_options().instrument_pass_enabled) {
  + TRACE(METH_PROF,
  + 1,
  + "Not an instrumentation build, not running InsertSourceBlocksPass");
  + }
  +
  run_source_blocks(stores,
  conf,
  mgr,
  