While emitting DBG_VALUE for registers spilled at the end of a block do not use locat...

While emitting DBG_VALUE for registers spilled at the end of a block do not use location of MBB->end(). If a block does not have terminator then incoming iterator points to end().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110411 91177308-0d34-0410-b5e6-96231b3b80d8