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

[Peter Collingbourne]

    - Document flag stuff

Hi eugenis, kcc, rsmith,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D502?vs=1373&id=1449#toc

BRANCH
  imply-pie

ARCANIST PROJECT
  clang

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