[cfe-commits] [PATCH] Allow PCHReader to be used without having a pre-initialized Preprocessor

[Argyrios Kyrtzidis]

Currently PCHReader depends on getting a pre-initialized Preprocessor.
The attached patch modifies PCHReader so that we can use it to load  
a .pch file, get the information we need and *afterwards* initialize a  
Preprocessor with that info.

-Argiris

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