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[clang-tidy] Pass absolute path to OptionsProvider::getOptions/getRawOptions.

Description

[clang-tidy] Pass absolute path to OptionsProvider::getOptions/getRawOptions.

Summary:
Although there is no guarantee of getOptions/getRawOptions receiving an
absolute path, we try to make it if possible. So FileOptionProvider subclasses
don't have to convert the path to an absolute path.

Reviewers: alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D22154