Precondition loops are better optimized by HotSpot
(and, quite likely, by ART).
Also, we generate more compact bytecode that way.
KT-17903 Generate 'for-in-indices' as a precondition loop
- A LINENUMEBER node is "dead" if the corresponding instruction interval
contains at least one "dead" bytecode instruction
and no live bytecode instructions
- Observable local variable lifetimes should be taken into account
when determining if a NOP is required for debugger.
NB: for-in-until loop is generated as precondition loop, because the
corresponding range is right-exclusive (and thus we have no problems
with integer overflows).
