[clang] Add BeforeExecute method to PrecompiledPreamble
Summary: Adds BeforeExecute method to PrecompiledPreamble to be called before Execute(). This method can be overriden. Patch by William Enright. Reviewers: malaperle, ilya-biryukov Reviewed By: ilya-biryukov Subscribers: arphaman, cfe-commits, ilya-biryukov Differential Revision: https://reviews.llvm.org/D41365 llvm-svn: 321189
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