PrologueEpilogInserter: Fix missing live-ins when savepoint equals restorepoint
The algorithm would not modify the live-in list of blocks below the save
block point which is correct unless it happens to be a restore point at
the same time.
Also fixes the benign issue of live-in registers being added twice in
some cases.
The testcase is based on a test submitted by Kit Barton.
Differential Revision: http://reviews.llvm.org/D13176
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248620
91177308-0d34-0410-b5e6-
96231b3b80d8
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