[PATCH] [nolibc] Change internal syscall API to remove reliance on libc's errno.

[Peter Collingbourne]

  Address reviewer comments

Hi kcc, rnk,

http://llvm-reviews.chandlerc.com/D756

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D756?vs=1857&id=1875#toc

Files:
  lib/sanitizer_common/sanitizer_common.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_internal_defs.h
  lib/sanitizer_common/sanitizer_libc.h
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_linux.h
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_posix.cc
  lib/sanitizer_common/sanitizer_stoptheworld_linux.cc
  lib/sanitizer_common/sanitizer_symbolizer_linux.cc
  lib/sanitizer_common/sanitizer_syscall_generic.inc
  lib/sanitizer_common/sanitizer_syscall_linux_x86_64.inc
  lib/sanitizer_common/sanitizer_win.cc
  lib/sanitizer_common/tests/sanitizer_libc_test.cc
  lib/tsan/rtl/tsan_platform_linux.cc
  lib/tsan/rtl/tsan_rtl.cc
  lib/tsan/rtl/tsan_suppressions.cc
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