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[clang] Add BeforeExecute method to PrecompiledPreamble

Authored by ilya-biryukov on Dec 20 2017, 8:48 AM.

Description

[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