[PATCH] If the user requested a zero-base-shadow sanitizer, infer -pie and -fPIC when appropriate.

[Peter Collingbourne]

    - Missed an OPT_pie check

Hi kcc, eugenis, rsmith,

http://llvm-reviews.chandlerc.com/D502

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D502?vs=1209&id=1220#toc

Files:
  docs/MemorySanitizer.rst
  docs/ThreadSanitizer.rst
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/SanitizerArgs.h
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  test/Driver/fsanitize.c
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