[PATCH] DataFlowSanitizer: Prefix the name of each instrumented function with "dfs$".

[Peter Collingbourne]

Hi eugenis,

This is probably the easiest way to ensure that the ABI stays consistent.

http://llvm-reviews.chandlerc.com/D1373

Files:
  lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
  test/Instrumentation/DataFlowSanitizer/abilist.ll
  test/Instrumentation/DataFlowSanitizer/args-unreachable-bb.ll
  test/Instrumentation/DataFlowSanitizer/arith.ll
  test/Instrumentation/DataFlowSanitizer/call.ll
  test/Instrumentation/DataFlowSanitizer/load.ll
  test/Instrumentation/DataFlowSanitizer/prefix-rename.ll
  test/Instrumentation/DataFlowSanitizer/store.ll
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