Revert "Add an optional parameter with a list of undefs to extendToIndices"
This reverts commit r280268, it causes all MSVC 2013 to ICE. This
appears to have been fixed in a later MSVC 2013 update, because I cannot
reproduce it locally. That said, all upstream LLVM bots are broken right
now, so I am reverting.
Also reverts dependent change r280275, "[Hexagon] Deal with undefs when
extending live intervals".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280301
91177308-0d34-0410-b5e6-
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