[PATCH] D20105: Implement verbose mode in FlieCheck and Lit to capture whole stdin.

[NAKAMURA Takumi via llvm-commits]

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This changes are aiming to capture and dump whole stdin to FileCheck.
In automated builders, we are often missing actual input, to wonder why the failure was.

- Implement -verbose in FileCheck to dump stdin to stderr.
- Introduce LLVM_FILECHECK to override default value of -verbose.
- Introduce LIT_PASS_VARS in Lit, to customize variables available in the test.

How to activate this changes;

  LIT_PASS_VARS=LLVM_FILECHECK LLVM_FILECHECK=-verbose bin/llvm-lit path/to/...

This patch is W-I-P. FIXME:
- Give the description for -verbose with cl::desc().
- Generalize LLVM_FILECHECK to accept additional options.
- Improve the output of -verbose.
- Add tests for -verbose itself.

Repository:
  rL LLVM

http://reviews.llvm.org/D20105

Files:
  llvm/test/FileCheck/check-label-dag.txt
  llvm/test/FileCheck/check-label.txt
  llvm/test/FileCheck/check-multiple-prefixes-nomatch-2.txt
  llvm/test/FileCheck/check-multiple-prefixes-nomatch.txt
  llvm/test/FileCheck/check-not-diaginfo.txt
  llvm/utils/FileCheck/FileCheck.cpp
  llvm/utils/lit/lit/TestingConfig.py

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