[PATCH] [DebugInfo][FastISel] Prevent using debug location from previous block for local values

[Sergey Dmitrouk]

Thanks to Fred I see that this is basically the same as an old patch (http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120917/151433.html) related to the bug of the same age (https://llvm.org/bugs/show_bug.cgi?id=14501), which was unfortunately rejected... Still pulled in Pauls nice test case and added missing changes here. I would prefer to have some kind of fix rather than have obviously wrong locations (provided that we don't make anything worse that it is at the moment).


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9887

Files:
  include/llvm/CodeGen/FastISel.h
  lib/CodeGen/SelectionDAG/FastISel.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  test/DebugInfo/ARM/single-constant-use-preserves-dbgloc.ll
  test/DebugInfo/X86/dbg-line-fast-isel.ll

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