[llvm] r359426 - [DebugInfo] Terminate more location-list ranges at the end of blocks

[Jeremy Morse via llvm-commits]

Follow up -- D61940 [0] fixes the performance problem by always
clearing LiveEntries at the end of a basic block, I now see asan build
performance the same as before r359426.

Technically the performance fix could be separated from killing off
ChangingRegs in [0], but this kills two birds with one stone.

[0] https://reviews.llvm.org/D61940