[NFC] Extract LastSplitPoint computation from SplitAnalysis to a new class
InsertPointAnalysis.

Because both split and spill hoisting want to use LastSplitPoint computation
result, extract the LastSplitPoint computation from SplitAnalysis class which
also contains a bunch of other analysises only related to split.

Differential Revision: http://reviews.llvm.org/D20027.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269248 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed