[PATCH] clang: does not add -pie for tsan

[Dmitry Vyukov]

Hi kcc,

Revision 220571 removes the requirement to use -pie for tsan binaries. So remove -pie from driver.
Also s/hasZeroBaseShadow/requiresPIE/ because that is what it is used for. Msan does not have zero-based shadow, but requires pie. And in general the relation between zero-based shadow and pie is unclear.

http://reviews.llvm.org/D6318

Files:
  include/clang/Driver/SanitizerArgs.h
  lib/Driver/SanitizerArgs.cpp
  lib/Driver/ToolChains.cpp
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