Use a faster algorithm for computing MBB live-in registers after register allocation.

LiveIntervals::findLiveInMBBs has to do a full binary search for each segment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129292 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed