Ben Langmuir 70a1b816cc A couple of readASTFileSignature improvements (NFC) ...

* Strength reduce a std::function to a function pointer,
* Factor out checking the AST file magic number,
* Add a brief doc comment to readAStFileSignature

Thanks to Chandler for spotting these oddities.

llvm-svn: 233050

2015-03-24 04:43:52 +00:00

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