[PATCH] Allow multiple check prefixes in FileCheck

[Matt Arsenault]

  Fix off by one that could reduce the reported @LINE.

  Add tests for @LINE that hit this since none of the main LLVM tests seem to hit this problem.

http://llvm-reviews.chandlerc.com/D1374

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1374?vs=4711&id=4786#toc

Files:
  docs/CommandGuide/FileCheck.rst
  test/FileCheck/check-a-b-has-b.txt
  test/FileCheck/check-b-a-has-b.txt
  test/FileCheck/check-dag-multi-prefix-2.txt
  test/FileCheck/check-dag-multi-prefix.txt
  test/FileCheck/check-dag-substring-prefix.txt
  test/FileCheck/check-multi-prefix-label.txt
  test/FileCheck/check-multiple-prefixes-mixed.txt
  test/FileCheck/check-prefixes.txt
  test/FileCheck/check-substring-multi-prefix-2.txt
  test/FileCheck/check-substring-multi-prefix.txt
  test/FileCheck/first-character-match.txt
  test/FileCheck/line-count-2.txt
  test/FileCheck/line-count.txt
  test/FileCheck/multiple-missing-prefixes.txt
  test/FileCheck/separate-multi-prefix.txt
  test/FileCheck/validate-check-prefix.txt
  utils/FileCheck/FileCheck.cpp
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