The new leader is known anyway so we can return it for some micro
optimization in code where it is easy to pass along the result to the
next join().
llvm-svn: 257130
This implementation already exists as ConnectedVNInfoEqClasses in
LiveInterval.cpp, and it seems to be generally useful to have a light-weight way
of forming equivalence classes of small integers.
IntEqClasses doesn't allow enumeration of the elements in a class.
llvm-svn: 122293
Richard Trieu