Instructions schedulers should report correct height/depth.

We avoided computing DAG height/depth during Node printing because it
shouldn't depend on an otherwise valid DAG. But this has become far
too annoying for the common case of a valid DAG where we want to see
valid values. If doing the computation on-the-fly turns out to be a
problem in practice, then I'll add a mode to the diagnostics to only
force it when we're likely to have a valid DAG, otherwise explicitly
print INVALID instead of bogus numbers. For now, just go for it all
the time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176314 91177308-0d34-0410-b5e6-96231b3b80d8
Fix incorrect ScheduleDAG comment and formalize Weak edges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176315 91177308-0d34-0410-b5e6-96231b3b80d8
Scheduler diagnostics. Print the register name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176316 91177308-0d34-0410-b5e6-96231b3b80d8