Bug 518034 NJ Merge: Minor Lir.cpp cleanups [njn] (r+me)
Bug 518034 NJ Merge: Minor Lir.cpp cleanups [njn] (r+me)

This patch:
- Has some whitespace changes.
- Wraps some uses of _stats.lir in verbose_only().
- Uses NULL instead of insImm(1) for a LIR_x condition (I'm not
  sure how TR works because LirBufWriter::insGuard() asserts
  that the condition is NULL... hmm).
- Adds a missing comment.

pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux