[PATCH] Allow multiple check prefixes in FileCheck

[Matt Arsenault]

  Add a test for CHECK-DAG with multiple prefixes

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1374?vs=3459&id=3585#toc

Files:
  docs/CommandGuide/FileCheck.rst
  test/FileCheck/check-dag-multi-prefix.txt
  test/FileCheck/check-multi-prefix-label.txt
  test/FileCheck/check-multiple-prefixes-mixed.txt
  test/FileCheck/check-prefixes.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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