Remove ad-hoc print of executed/cached steps in verbose mode

When verbose mode is enabled, it is very hard to see the actually executed steps.

Author: Kobzol

src/bootstrap/src/core/builder/mod.rs

@@ -1677,8 +1677,6 @@ You have to build a stage1 compiler for `{}` first, and then use it to build a s
  panic!("{}", out);
  }
  if let Some(out) = self.cache.get(&step) {
- self.verbose_than(1, || println!("{}c {:?}", " ".repeat(stack.len()), step));
-
  #[cfg(feature = "tracing")]
  {
  if let Some(parent) = stack.last() {
@@ -1688,7 +1686,6 @@ You have to build a stage1 compiler for `{}` first, and then use it to build a s
  }
  return out;
  }
- self.verbose_than(1, || println!("{}> {:?}", " ".repeat(stack.len()), step));
 
  #[cfg(feature = "tracing")]
  {
@@ -1749,7 +1746,6 @@ You have to build a stage1 compiler for `{}` first, and then use it to build a s
  let cur_step = stack.pop().expect("step stack empty");
  assert_eq!(cur_step.downcast_ref(), Some(&step));
  }
- self.verbose_than(1, || println!("{}< {:?}", " ".repeat(self.stack.borrow().len()), step));
  self.cache.put(step, out.clone());
  out
  }