[PATCH] [sanitizer] Improve scanf interceptor

[Evgeniy Stepanov]

  I've completely disabled %a due to its ambiguity.

Hi kcc, samsonov,

http://llvm-reviews.chandlerc.com/D381

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D381?vs=923&id=925#toc

Files:
  sanitizer_common_interceptors.inc
  tests/sanitizer_scanf_interceptor_test.cc
  sanitizer_common_interceptors_scanf.inc
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