[PATCH] fast-isel: remove dead code after falling back from selecting call instructions (PR20863)

[Hans Wennborg]

> Could you also add an unit test that checks that the local value area didn't get accidentally deleted as dead code too?

Like this? (See attached patch)

http://reviews.llvm.org/D5249

Files:
  include/llvm/CodeGen/FastISel.h
  lib/CodeGen/SelectionDAG/FastISel.cpp
  test/CodeGen/X86/fast-isel-x86.ll
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