[PATCH] Separate file parsing from File's constructors.

[Simon Atanasyan]

LGTM


================
Comment at: include/lld/Core/File.h:159
@@ +158,3 @@
+  /// memory buffer passed to this file's constructor.
+  virtual std::error_code doParse() { return std::error_code(); }
+
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Can we make this virtual method abstract?

http://reviews.llvm.org/D6633

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